ATtiny167 Automotive Atmel Corporation, ATtiny167 Automotive Datasheet - Page 188

• Manufacturer Part Number: ATtiny167 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATtiny167 Automotive

• Flash (kbytes): 16 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 8
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 16
• Ext Interrupts: 16
• Usb Speed: No
• Usb Interface: No
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Lin: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.5
• Eeprom (bytes): 512
• 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: 3
• Input Capture Channels: 1
• Pwm Channels: 9
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

16. ISRC - Current Source
16.1
16.2
16.2.1
188
Features
Typical applications
ATtiny87/ATtiny167
LIN Current Source
•
•
The ATtiny87/167 features a 100µA ±10% Current Source. Up on request, the current is flow-
ing through an external resistor. The voltage can be measured on the dedicated pin shared
with the ADC. Using a resistor in serie with a 0.5% tolerance is recommended. To protect the
device against big values, the ADC must be configured with AVcc as internal reference to per-
form 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 16-1. Current Source Block Diagram
During the configuration of a LIN node in a cluster, it may be necessary to attribute dynami-
cally an unique physical address to every cluster node. The way to do it is not described in the
LIN protocol.
The Current Source offers an excellent solution to associate a physical address to the applica-
tion supported by the LIN node. A full dynamic node configuration can be used to set-up the
LIN nodes in a cluster.
ATtiny87/167 proposes to have an external resistor used in conjunction with the Current
Source. The device measures the voltage to the boundaries of the resistance via the Analog to
Digital converter. The resulting voltage defines the physical address that the communication
handler will use when the node will participate in LIN communication.
100µA Constant current source
±10% Absolute Accuracy
ADC Input
100 uA
AVCC
ISRCEN
ADCn/ ISRC
Resistor
External
7728G–AVR–06/10