ATtiny861 Automotive Atmel Corporation, ATtiny861 Automotive Datasheet - Page 156

• Manufacturer Part Number: ATtiny861 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATtiny861 Automotive

• Flash (kbytes): 8 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: 1
• Twi (i2c): 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: 6
• Input Capture Channels: 1
• Pwm Channels: 6
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

19.9.1
156
ATtiny261/ATtiny461/ATtiny861
Manufacturing Calibration
Calibration values determined during test are available in the signature row.
The temperature in degrees Celsius can be calculated using the formula:
Where:
a. ADCH & ADCL are the ADC data registers,
b. is the temperature sensor gain
c. TS_OFFSET is the temperature sensor offset correction term
TS_GAIN is the unsigned fixed point 8-bit temperature sensor gain factor in 1/128th units stored
in the signature row.
TS_OFFSET is the signed twos complement temperature sensor offset reading stored in the sig-
nature row.
The table below summarizes the parameter signature row address vs product.
Table 19-3.
The following code example allows to read Signature Row data
T
=
.equ TS_GAIN = 0x0007
.equ TS_OFFSET = 0x0005
--------------------------------------------------------------------------------------------------------------------------------------------------------------------- -
TS_OFFSET
TS_GAIN
LDI R30,LOW(TS_GAIN)
LDI R31,HIGH (TS_GAIN)
RCALL Read_signature_row
MOV R17,R16
LDI R30,LOW(TS_OFFSET)
LDI R31,HIGH (TS_OFFSET)
RCALL Read_signature_row
; R16 holds TS_OFFSET and R17 holds TS_GAIN
Read_signature_row:
IN R16,SPMCSR
SBRC R16,SPMEN
RJMP Read_signature_row
LDI R16,((1<<SIGRD)|(1<<SPMEN)) ; We need to set SIGRD and SPMEN
OUT SPMCSR,R16
LPM R16,Z
RET
ADCH << 8 I ADCL
Parameter Signature Row Address vs. Product
; Wait for SPMEN ready
; Exit loop here when SPMCSR is free
ATtiny261
–
TS_GAIN
0x1E
0x1F
; and execute the LPM within 3 cycles
273
+
25 TS_OFFSET
–
; Save R16 result
together
ATtiny461
0x05
0x07
128
+
25
ATtiny861
7753F–AVR–01/11
0x05
0x07