ATmega32C1 Automotive Atmel Corporation, ATmega32C1 Automotive Datasheet - Page 258

• Manufacturer Part Number: ATmega32C1 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATmega32C1 Automotive

• Flash (kbytes): 32 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 27
• Ext Interrupts: 27
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 1
• Can: 1
• Lin: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 125
• Analog Comparators: 4
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 2
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 150
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

19. ISRC - Current Source
19.1
258
Features
Atmel ATmega16/32/64/M1/C1
•
•
The ATmega16/32/64/M1/C1 features a 100µA ±5% Current Source. After RESET or up on
request, the current is flowing through an external resistor. The voltage can be measured on
the dedicated pin shared with the ADC. Using a resistor in serie with a
ommended. To protect the device against big values, the ADC must be configured with AVcc
as internal reference to perform the first measurement. Afterwards, another internal reference
can be chosen according to the previous measured value to refine the result.
When ISRCEN bit is set, the ISRC pin sources 100µA. Otherwise this pin keeps its initial
function.
Figure 19-1. Current Source Block Diagram
AREF Internal Circuit
100µA Constant current source
±6% Absolute Accuracy
ADC Input
100 uA
AREFEN
AVCC
ISRCEN
AREF / ISRC
External
Resistor
0.5% tolerance is rec-
7647G–AVR–09/11