3
SAM4CM Series [DATASHEET]
Atmel-11203C-ATARM-SAM4CM32-SAM4CM16-SAM4CM8-Datasheet_06-Oct-14
Clock
Optional 3 to 20 MHz quartz or ceramic resonator oscillators with clock failure detection
Ultra-low-power 32.768 kHz crystal oscillator for RTC with frequency monitoring
High-precision 4/8/12 MHz factory-trimmed internal RC oscillator with on-the-fly trimming capability
One high-frequency PLL up to 240 MHz, one 8 MHz PLL with internal 32 kHz input, as source for
high-frequency PLL
Low-power slow clock internal RC oscillator as permanent clock
Ultra-low-power RTC with Gregorian and Persian Calendar, Waveform Generation in Low-power
modes and Clock Calibration Circuitry for 32.768 kHz Crystal Frequency Compensation Circuitry
Up to 23 Peripheral DMA (PDC) Channels
Shared Peripherals
One Segmented LCD Controller
Display capacity of 38 segments and 6 common terminals
Software-selectable LCD output voltage (Contrast)
Low current consumption in Low-power mode
Can be used in Backup mode
Up to four USARTs with ISO7816, IrDA
, RS-485, SPI and Manchester Mode
Two 2-wire UARTs with one UART (UART1) supporting optical transceiver providing an electrically
isolated serial communication with hand-held equipment, such as calibrators, compliant with ANSI-
C12.18 or IEC62056-21 norms
Up to two 400 kHz Master/Slave and Multi-Master Two-wire Interfaces (I
2
C compatible)
Up to four Serial Peripheral Interfaces (SPI)
Two 3-channel 16-bit Timer/Counters with Capture, Waveform, Compare and PWM modes
Quadrature Decoder Logic and 2-bit Gray Up/Down Counter for Stepper Motor
3-channel 16-bit Pulse Width Modulator
32-bit Real-time Timer
Energy Metering Analog Front-End
Two-phase (SAM4CMS) or three-phase (SAM4CMP) Energy Metering Analog Front-End
Works with the Atmel MCU Metrology library
Compliant with Class 0.2 standards (ANSI C12.20-2002 and IEC 62053-22)
Four or seven Sigma-Delta ADC measurement channels, 20-bit resolution, 102 dB dynamic range
Current channels with Pre-gain (x1, x2, x4, x8) support directly connected Shunt, Current Transformer
and Rogowsky Coils sensors without any active components
Dedicated current channel for neutral current measurement (anti-tamper)
1.2V Precision Voltage Reference. Temperature drift: 10 ppm/C typ. with software correction using
factory programmed calibration registers
Dedicated 2.8V LDO regulator to supply the Analog Front-End
3.0V to 3.6V operation, ultra-low-power: < 2.5 mW / channel @ 3.3V
Analog Conversion Block
8-channel, 500 kS/s, Low-power 10-bit SAR ADC with Digital Averager providing 12-bit Resolution
at 30 kS/s
Software-controlled On-chip Reference ranging from 1.6V to 3.4V
Temperature Sensor and Backup Battery Voltage Measurement Channel