32-bit ARM CortexTM-M0 - NuMicro® Family



M031 Series

The series of NuMicro Family ultra-low power 32-bit microcontrollers based on the ARM Cortex-M0 core, running up to 48/72 MHz within -40 – +105 °C and equipped with rich peripherals and interfaces.
All Ics are RoHS compliant.

* Status: P - mass production, S - samples, UD - under development, N - not recommended for new design.

Chip Description Application Flash SRAM Data FlashLoader FlashProgramm.
methods
Clock
  frequency  
Supply
  voltage  
[V]
Operating
temperature
[°C]
   Package   Status *
M031EB0AE
  • operating frequency up to 48/72 MHz
  • programmable system clock source
  • 2 external crystal oscillators and 2 internal RC oscillators
  • PLL controller (the source of system clock up to 144 MHz) sourced from 2 high speed oscillators: crystal or RC
  • 512 B of Security Protection ROM (SPROM)
  • up to 23 I/Os
  • 2 x 32-bit timers
  • Watchdog
  • 32 interrupts
  • interfaces: 3 x UART, SPI, 2 x I2C, I2S
  • supports CRC-CCITT, CRC-8, CRC-16 and CRC-32 error-detecting codes
  • 6-channel 16-bit PWM
  • 9-channel 12-bit ADC
  • LDO regulator
  • LVR (Low Voltage Reset)
  • 2-level BOD
  • low power consumption in operating mode: 180 µA/MHz
16 KB2 KBconfigurable2 KBISP
ICP
IAP
Ext. crystal:
4 - 32 MHz
32.768 kHz

Int. RC:
48 MHz
38.4 kHz
1.8 – 3.6-40 – +105TSSOP-28
(4.4x9.7-mm)
P
M031EC1AE
  • operating frequency up to 48/72 MHz
  • programmable system clock source
  • 2 external crystal oscillators and 2 internal RC oscillators
  • PLL controller (the source of system clock up to 144 MHz) sourced from 2 high speed oscillators: crystal or RC
  • 512 B of Security Protection ROM (SPROM)
  • 2-channel PDMA
  • up to 23 I/Os
  • 4 x 32-bit timers
  • Watchdog
  • 32 interrupts
  • interfaces: 3 x UART, SPI, 2 x I2C, I2S
  • supports CRC-CCITT, CRC-8, CRC-16 and CRC-32 error-detecting codes
  • 6-channel 16-bit PWM
  • 9-channel 12-bit ADC
  • LDO regulator
  • LVR (Low Voltage Reset)
  • 2-level BOD
  • low power consumption in operating mode: 180 µA/MHz
32 KB4 KBconfigurable2 KBISP
ICP
IAP
Ext. crystal:
4 - 32 MHz
32.768 kHz

Int. RC:
48 MHz
38.4 kHz
1.8 – 3.6-40 – +105TSSOP-28
(4.4x9.7-mm)
P
M031FB0AE
  • operating frequency up to 48/72 MHz
  • programmable system clock source
  • 2 external crystal oscillators and 2 internal RC oscillators
  • PLL controller (the source of system clock up to 144 MHz) sourced from 2 high speed oscillators: crystal or RC
  • 512 B of Security Protection ROM (SPROM)
  • up to 15 I/Os
  • 2 x 32-bit timers
  • Watchdog
  • 32 interrupts
  • interfaces: 3 x UART, SPI, 2 x I2C, I2S
  • supports CRC-CCITT, CRC-8, CRC-16 and CRC-32 error-detecting codes
  • 6-channel 16-bit PWM
  • 7-channel 12-bit ADC
  • LDO regulator
  • LVR (Low Voltage Reset)
  • 2-level BOD
  • low power consumption in operating mode: 180 µA/MHz
16 KB2 KBconfigurable2 KBISP
ICP
IAP
Ext. crystal:
4 - 32 MHz
32.768 kHz

Int. RC:
48 MHz
38.4 kHz
1.8 – 3.6-40 – +105TSSOP-20
(4.4x6.5-mm)
P
M031FC1AE
  • operating frequency up to 48/72 MHz
  • programmable system clock source
  • 2 external crystal oscillators and 2 internal RC oscillators
  • PLL controller (the source of system clock up to 144 MHz) sourced from 2 high speed oscillators: crystal or RC
  • 512 B of Security Protection ROM (SPROM)
  • 2-channel PDMA
  • up to 15 I/Os
  • 4 x 32-bit timers
  • Watchdog
  • 32 interrupts
  • interfaces: 3 x UART, SPI, 2 x I2C, I2S
  • supports CRC-CCITT, CRC-8, CRC-16 and CRC-32 error-detecting codes
  • 6-channel 16-bit PWM
  • 7-channel 12-bit ADC
  • LDO regulator
  • LVR (Low Voltage Reset)
  • 2-level BOD
  • low power consumption in operating mode: 180 µA/MHz
32 KB4 KBconfigurable2 KBISP
ICP
IAP
Ext. crystal:
4 - 32 MHz
32.768 kHz

Int. RC:
48 MHz
38.4 kHz
1.8 – 3.6-40 – +105TSSOP-20
(4,4x6.5-mm)
P
M031KG6AE
  • operating frequency up to 48/72 MHz
  • programmable system clock source
  • 2 external crystal oscillators and 2 internal RC oscillators
  • PLL controller (the source of system clock up to 144 MHz) sourced from 2 high speed oscillators: crystal or RC
  • 2 KB of Security Protection ROM (SPROM)
  • 7-channel PDMA
  • up to 111 I/Os
  • 4 x 32-bit timers
  • Watchdog
  • RTC
  • 32 interrupts
  • interfaces: 6 x UART, 2 x SPI, 2 x I2C, I2S, EBI (External Bus Interface)
  • supports CRC-CCITT, CRC-8, CRC-16 and CRC-32 error-detecting codes
  • 24-channel 16-bit PWM
  • 16-channel 12-bit ADC
  • 2 analog comparators
  • LDO regulator
  • LVR (Low Voltage Reset)
  • 2-level BOD
  • low power consumption in operating mode: 180 µA/MHz
256 KB32 KBconfigurable4 KBISP
ICP
IAP
Ext. crystal:
4 - 32 MHz
32.768 kHz

Int. RC:
48 MHz
38.4 kHz
1.8 – 3.6-40 – +105LQFP-128
(14x14-mm)
P
M031KG8AE
  • operating frequency up to 48/72 MHz
  • programmable system clock source
  • 2 external crystal oscillators and 2 internal RC oscillators
  • PLL controller (the source of system clock up to 144 MHz) sourced from 2 high speed oscillators: crystal or RC
  • 2 KB of Security Protection ROM (SPROM)
  • 7-channel PDMA
  • up to 111 I/Os
  • 4 x 32-bit timers
  • Watchdog
  • RTC
  • 32 interrupts
  • interfaces: 6 x UART, 2 x SPI, 2 x I2C, I2S, EBI (External Bus Interface)
  • supports CRC-CCITT, CRC-8, CRC-16 and CRC-32 error-detecting codes
  • 24-channel 16-bit PWM
  • 16-channel 12-bit ADC
  • 2 analog comparators
  • LDO regulator
  • LVR (Low Voltage Reset)
  • 2-level BOD
  • low power consumption in operating mode: 180 µA/MHz
256 KB64 KBconfigurable4 KBISP
ICP
IAP
Ext. crystal:
4 - 32 MHz
32.768 kHz

Int. RC:
48 MHz
38.4 kHz
1.8 – 3.6-40 – +105LQFP-128
(14x14-mm)
P
M031KIAAE
  • operating frequency up to 48/72 MHz
  • programmable system clock source
  • 2 external crystal oscillators and 2 internal RC oscillators
  • PLL controller (the source of system clock up to 144 MHz) sourced from 2 high speed oscillators: crystal or RC
  • 2 KB of Security Protection ROM (SPROM)
  • 9-channel PDMA
  • up to 111 I/Os
  • 4 x 32-bit timers
  • Watchdog
  • RTC
  • 32 interrupts
  • interfaces: 8 x UART, 2 x SPI, 2 x I2C, I2S, EBI (External Bus Interface)
  • supports CRC-CCITT, CRC-8, CRC-16 and CRC-32 error-detecting codes
  • 24-channel 16-bit PWM
  • 16-channel 12-bit ADC
  • 2 analog comparators
  • LDO regulator
  • LVR (Low Voltage Reset)
  • 2-level BOD
  • low power consumption in operating mode: 180 µA/MHz
512 KB96 KBconfigurable8 KBISP
ICP
IAP
Ext. crystal:
4 - 32 MHz
32.768 kHz

Int. RC:
48 MHz
38.4 kHz
1.8 – 3.6-40 – +105LQFP-128
(14x14-mm)
P
M031LC2AE
  • operating frequency up to 48/72 MHz
  • programmable system clock source
  • 2 external crystal oscillators and 2 internal RC oscillators
  • PLL controller (the source of system clock up to 144 MHz) sourced from 2 high speed oscillators: crystal or RC
  • 512 B of Security Protection ROM (SPROM)
  • 5-channel PDMA
  • up to 42 I/Os
  • 4 x 32-bit timers
  • Watchdog
  • 32 interrupts
  • interfaces: 3 x UART, SPI, 2 x I2C, I2S
  • supports CRC-CCITT, CRC-8, CRC-16 and CRC-32 error-detecting codes
  • 12-channel 16-bit PWM
  • 12-channel 12-bit ADC
  • 2 analog comparators
  • LDO regulator
  • LVR (Low Voltage Reset)
  • 2-level BOD
  • low power consumption in operating mode: 180 µA/MHz
32 KB8 KBconfigurable2 KBISP
ICP
IAP
Ext. crystal:
4 - 32 MHz
32.768 kHz

Int. RC:
48 MHz
38.4 kHz
1.8 – 3.6-40 – +105LQFP-48
(7x7-mm)
P
M031LD2AE
  • operating frequency up to 48/72 MHz
  • programmable system clock source
  • 2 external crystal oscillators and 2 internal RC oscillators
  • PLL controller (the source of system clock up to 144 MHz) sourced from 2 high speed oscillators: crystal or RC
  • 512 B of Security Protection ROM (SPROM)
  • 5-channel PDMA
  • up to 42 I/Os
  • 4 x 32-bit timers
  • Watchdog
  • 32 interrupts
  • interfaces: 3 x UART, SPI, 2 x I2C, I2S
  • supports CRC-CCITT, CRC-8, CRC-16 and CRC-32 error-detecting codes
  • 12-channel 16-bit PWM
  • 12-channel 12-bit ADC
  • 2 analog comparators
  • LDO regulator
  • LVR (Low Voltage Reset)
  • 2-level BOD
  • low power consumption in operating mode: 180 µA/MHz
64 KB8 KBconfigurable2 KBISP
ICP
IAP
Ext. crystal:
4 - 32 MHz
32.768 kHz

Int. RC:
48 MHz
38.4 kHz
1.8 – 3.6-40 – +105LQFP-48
(7x7-mm)
P
M031LE3AE
  • operating frequency up to 48/72 MHz
  • programmable system clock source
  • 2 external crystal oscillators and 2 internal RC oscillators
  • PLL controller (the source of system clock up to 144 MHz) sourced from 2 high speed oscillators: crystal or RC
  • 512 B of Security Protection ROM (SPROM)
  • 5-channel PDMA
  • up to 42 I/Os
  • 4 x 32-bit timers
  • Watchdog
  • 32 interrupts
  • interfaces: 3 x UART, SPI, 2 x I2C, I2S, EBI (External Bus Interface)
  • supports CRC-CCITT, CRC-8, CRC-16 and CRC-32 error-detecting codes
  • 12-channel 16-bit PWM
  • 12-channel 12-bit ADC
  • 2 analog comparators
  • LDO regulator
  • LVR (Low Voltage Reset)
  • 2-level BOD
  • low power consumption in operating mode: 180 µA/MHz
128 KB16 KBconfigurable4 KBISP
ICP
IAP
Ext. crystal:
4 - 32 MHz
32.768 kHz

Int. RC:
48 MHz
38.4 kHz
1.8 – 3.6-40 – +105LQFP-48
(7x7-mm)
P
M031LG6AE
  • operating frequency up to 48/72 MHz
  • programmable system clock source
  • 2 external crystal oscillators and 2 internal RC oscillators
  • PLL controller (the source of system clock up to 144 MHz) sourced from 2 high speed oscillators: crystal or RC
  • 2 KB of Security Protection ROM (SPROM)
  • 7-channel PDMA
  • up to 42 I/Os
  • 4 x 32-bit timers
  • Watchdog
  • RTC
  • 32 interrupts
  • interfaces: 6 x UART, 2 x SPI, 2 x I2C, I2S, EBI (External Bus Interface)
  • supports CRC-CCITT, CRC-8, CRC-16 and CRC-32 error-detecting codes
  • 24-channel 16-bit PWM
  • 12-channel 12-bit ADC
  • 2 analog comparators
  • LDO regulator
  • LVR (Low Voltage Reset)
  • 2-level BOD
  • low power consumption in operating mode: 180 µA/MHz
256 KB32 KBconfigurable4 KBISP
ICP
IAP
Ext. crystal:
4 - 32 MHz
32.768 kHz

Int. RC:
48 MHz
38.4 kHz
1.8 – 3.6-40 – +105LQFP-48
(7x7-mm)
P
M031LG8AE
  • operating frequency up to 48/72 MHz
  • programmable system clock source
  • 2 external crystal oscillators and 2 internal RC oscillators
  • PLL controller (the source of system clock up to 144 MHz) sourced from 2 high speed oscillators: crystal or RC
  • 2 KB of Security Protection ROM (SPROM)
  • 7-channel PDMA
  • up to 42 I/Os
  • 4 x 32-bit timers
  • Watchdog
  • RTC
  • 32 interrupts
  • interfaces: 6 x UART, 2 x SPI, 2 x I2C, I2S, EBI (External Bus Interface)
  • supports CRC-CCITT, CRC-8, CRC-16 and CRC-32 error-detecting codes
  • 24-channel 16-bit PWM
  • 12-channel 12-bit ADC
  • 2 analog comparators
  • LDO regulator
  • LVR (Low Voltage Reset)
  • 2-level BOD
  • low power consumption in operating mode: 180 µA/MHz
256 KB64 KBconfigurable4 KBISP
ICP
IAP
Ext. crystal:
4 - 32 MHz
32.768 kHz

Int. RC:
48 MHz
38.4 kHz
1.8 – 3.6-40 – +105LQFP-48
(7x7-mm)
P
M031SC2AE
  • operating frequency up to 48/72 MHz
  • programmable system clock source
  • 2 external crystal oscillators and 2 internal RC oscillators
  • PLL controller (the source of system clock up to 144 MHz) sourced from 2 high speed oscillators: crystal or RC
  • 512 B of Security Protection ROM (SPROM)
  • 5-channel PDMA
  • up to 55 I/Os
  • 4 x 32-bit timers
  • Watchdog
  • 32 interrupts
  • interfaces: 3 x UART, SPI, 2 x I2C, I2S
  • supports CRC-CCITT, CRC-8, CRC-16 and CRC-32 error-detecting codes
  • 12-channel 16-bit PWM
  • 16-channel 12-bit ADC
  • 2 analog comparators
  • LDO regulator
  • LVR (Low Voltage Reset)
  • 2-level BOD
  • low power consumption in operating mode: 180 µA/MHz
32 KB8 KBconfigurable2 KBISP
ICP
IAP
Ext. crystal:
4 - 32 MHz
32.768 kHz

Int. RC:
48 MHz
38.4 kHz
1.8 – 3.6-40 – +105LQFP-64
(7x7-mm)
P
M031SD2AE
  • operating frequency up to 48/72 MHz
  • programmable system clock source
  • 2 external crystal oscillators and 2 internal RC oscillators
  • PLL controller (the source of system clock up to 144 MHz) sourced from 2 high speed oscillators: crystal or RC
  • 512 B of Security Protection ROM (SPROM)
  • 5-channel PDMA
  • up to 55 I/Os
  • 4 x 32-bit timers
  • Watchdog
  • 32 interrupts
  • interfaces: 3 x UART, SPI, 2 x I2C, I2S
  • supports CRC-CCITT, CRC-8, CRC-16 and CRC-32 error-detecting codes
  • 12-channel 16-bit PWM
  • 16-channel 12-bit ADC
  • 2 analog comparators
  • LDO regulator
  • LVR (Low Voltage Reset)
  • 2-level BOD
  • low power consumption in operating mode: 180 µA/MHz
64 KB8 KBconfigurable2 KBISP
ICP
IAP
Ext. crystal:
4 - 32 MHz
32.768 kHz

Int. RC:
48 MHz
38.4 kHz
1.8 – 3.6-40 – +105LQFP-64
(7x7-mm)
P
M031SE3AE
  • operating frequency up to 48/72 MHz
  • programmable system clock source
  • 2 external crystal oscillators and 2 internal RC oscillators
  • PLL controller (the source of system clock up to 144 MHz) sourced from 2 high speed oscillators: crystal or RC
  • 512 B of Security Protection ROM (SPROM)
  • 5-channel PDMA
  • up to 55 I/Os
  • 4 x 32-bit timers
  • Watchdog
  • 32 interrupts
  • interfaces: 3 x UART, SPI, 2 x I2C, I2S, EBI (External Bus Interface)
  • supports CRC-CCITT, CRC-8, CRC-16 and CRC-32 error-detecting codes
  • 12-channel 16-bit PWM
  • 16-channel 12-bit ADC
  • 2 analog comparators
  • LDO regulator
  • LVR (Low Voltage Reset)
  • 2-level BOD
  • low power consumption in operating mode: 180 µA/MHz
128 KB16 KBconfigurable4 KBISP
ICP
IAP
Ext. crystal:
4 - 32 MHz
32.768 kHz

Int. RC:
48 MHz
38.4 kHz
1.8 – 3.6-40 – +105LQFP-64
(7x7-mm)
P
M031SG6AE
  • operating frequency up to 48/72 MHz
  • programmable system clock source
  • 2 external crystal oscillators and 2 internal RC oscillators
  • PLL controller (the source of system clock up to 144 MHz) sourced from 2 high speed oscillators: crystal or RC
  • 2 KB of Security Protection ROM (SPROM)
  • 7-channel PDMA
  • up to 55 I/Os
  • 4 x 32-bit timers
  • Watchdog
  • RTC
  • 32 interrupts
  • interfaces: 6 x UART, 2 x SPI, 2 x I2C, I2S, EBI (External Bus Interface)
  • supports CRC-CCITT, CRC-8, CRC-16 and CRC-32 error-detecting codes
  • 24-channel 16-bit PWM
  • 16-channel 12-bit ADC
  • 2 analog comparators
  • LDO regulator
  • LVR (Low Voltage Reset)
  • 2-level BOD
  • low power consumption in operating mode: 180 µA/MHz
256 KB32 KBconfigurable4 KBISP
ICP
IAP
Ext. crystal:
4 - 32 MHz
32.768 kHz

Int. RC:
48 MHz
38.4 kHz
1.8 – 3.6-40 – +105LQFP-64
(7x7-mm)
P
M031SG8AE
  • operating frequency up to 48/72 MHz
  • programmable system clock source
  • 2 external crystal oscillators and 2 internal RC oscillators
  • PLL controller (the source of system clock up to 144 MHz) sourced from 2 high speed oscillators: crystal or RC
  • 2 KB of Security Protection ROM (SPROM)
  • 7-channel PDMA
  • up to 55 I/Os
  • 4 x 32-bit timers
  • Watchdog
  • RTC
  • 32 interrupts
  • interfaces: 6 x UART, 2 x SPI, 2 x I2C, I2S, EBI (External Bus Interface)
  • supports CRC-CCITT, CRC-8, CRC-16 and CRC-32 error-detecting codes
  • 24-channel 16-bit PWM
  • 16-channel 12-bit ADC
  • 2 analog comparators
  • LDO regulator
  • LVR (Low Voltage Reset)
  • 2-level BOD
  • low power consumption in operating mode: 180 µA/MHz
256 KB64 KBconfigurable4 KBISP
ICP
IAP
Ext. crystal:
4 - 32 MHz
32.768 kHz

Int. RC:
48 MHz
38.4 kHz
1.8 – 3.6-40 – +105LQFP-64
(7x7-mm)
P
M031SIAAE
  • operating frequency up to 48/72 MHz
  • programmable system clock source
  • 2 external crystal oscillators and 2 internal RC oscillators
  • PLL controller (the source of system clock up to 144 MHz) sourced from 2 high speed oscillators: crystal or RC
  • 2 KB of Security Protection ROM (SPROM)
  • 9-channel PDMA
  • up to 55 I/Os
  • 4 x 32-bit timers
  • Watchdog
  • RTC
  • 32 interrupts
  • interfaces: 8 x UART, 2 x SPI, 2 x I2C, I2S, EBI (External Bus Interface)
  • supports CRC-CCITT, CRC-8, CRC-16 and CRC-32 error-detecting codes
  • 24-channel 16-bit PWM
  • 16-channel 12-bit ADC
  • 2 analog comparators
  • LDO regulator
  • LVR (Low Voltage Reset)
  • 2-level BOD
  • low power consumption in operating mode: 180 µA/MHz
512 KB96 KBconfigurable8 KBISP
ICP
IAP
Ext. crystal:
4 - 32 MHz
32.768 kHz

Int. RC:
48 MHz
38.4 kHz
1.8 – 3.6-40 – +105LQFP-64
(7x7-mm)
P
M031TB0AE
  • operating frequency up to 48/72 MHz
  • programmable system clock source
  • 2 external crystal oscillators and 2 internal RC oscillators
  • PLL controller (the source of system clock up to 144 MHz) sourced from 2 high speed oscillators: crystal or RC
  • 512 B of Security Protection ROM (SPROM)
  • up to 27 I/Os
  • 2 x 32-bit timers
  • Watchdog
  • 32 interrupts
  • interfaces: 3 x UART, SPI, 2 x I2C, I2S
  • supports CRC-CCITT, CRC-8, CRC-16 and CRC-32 error-detecting codes
  • 6-channel 16-bit PWM
  • 10-channel 12-bit ADC
  • LDO regulator
  • LVR (Low Voltage Reset)
  • 2-level BOD
  • low power consumption in operating mode: 180 µA/MHz
16 KB2 KBconfigurable2 KBISP
ICP
IAP
Ext. crystal:
4 - 32 MHz
32.768 kHz

Int. RC:
48 MHz
38.4 kHz
1.8 – 3.6-40 – +105QFN-33
(4x4-mm)
P
M031TC1AE
  • operating frequency up to 48/72 MHz
  • programmable system clock source
  • 2 external crystal oscillators and 2 internal RC oscillators
  • PLL controller (the source of system clock up to 144 MHz) sourced from 2 high speed oscillators: crystal or RC
  • 512 B of Security Protection ROM (SPROM)
  • 2-channel PDMA
  • up to 27 I/Os
  • 4 x 32-bit timers
  • Watchdog
  • 32 interrupts
  • interfaces: 3 x UART, SPI, 2 x I2C, I2S
  • supports CRC-CCITT, CRC-8, CRC-16 and CRC-32 error-detecting codes
  • 6-channel 16-bit PWM
  • 10-channel 12-bit ADC
  • LDO regulator
  • LVR (Low Voltage Reset)
  • 2-level BOD
  • low power consumption in operating mode: 180 µA/MHz
32 KB4 KBconfigurable2 KBISP
ICP
IAP
Ext. crystal:
4 - 32 MHz
32.768 kHz

Int. RC:
48 MHz
38.4 kHz
1.8 – 3.6-40 – +105QFN-33
(4x4-mm)
P
M031TD2AE
  • operating frequency up to 48/72 MHz
  • programmable system clock source
  • 2 external crystal oscillators and 2 internal RC oscillators
  • PLL controller (the source of system clock up to 144 MHz) sourced from 2 high speed oscillators: crystal or RC
  • 512 B of Security Protection ROM (SPROM)
  • 5-channel PDMA
  • up to 27 I/Os
  • 4 x 32-bit timers
  • Watchdog
  • 32 interrupts
  • interfaces: 3 x UART, SPI, 2 x I2C, I2S
  • supports CRC-CCITT, CRC-8, CRC-16 and CRC-32 error-detecting codes
  • 12-channel 16-bit PWM
  • 10-channel 12-bit ADC
  • 2 analog comparators
  • LDO regulator
  • LVR (Low Voltage Reset)
  • 2-level BOD
  • low power consumption in operating mode: 180 µA/MHz
64 KB8 KBconfigurable2 KBISP
ICP
IAP
Ext. crystal:
4 - 32 MHz
32.768 kHz

Int. RC:
48 MHz
38.4 kHz
1.8 – 3.6-40 – +105QFN-33
(4x4-mm)
P


PDW MARTHEL
ul. Sosnowa 24-5 Bielany Wroc³awskie 55-040 Kobierzyce
tel. +48 71 311 07 11 fax: +48 71 311 07 13 marthelinfo@marthel.pl