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ATtiny261-ESSZ Scheda tecnica(PDF) 156 Page - ATMEL Corporation

Il numero della parte ATtiny261-ESSZ
Spiegazioni elettronici  8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
PDF  227 Pages
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Produttore elettronici  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATtiny261-ESSZ Scheda tecnica(HTML) 156 Page - ATMEL Corporation

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156
7753C–AVR–07/09
ATtiny261/ATtiny461/ATtiny861
19.9.1
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.
The following code example allows to read Signature Row data
.equ TS_GAIN = 0x0007
.equ TS_OFFSET = 0x0005
LDI R30,LOW(TS_GAIN)
LDI R31,HIGH (TS_GAIN)
RCALL Read_signature_row
MOV R17,R16
; Save R16 result
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
; Wait for SPMEN ready
SBRC R16,SPMEN
; Exit loop here when SPMCSR is free
RJMP Read_signature_row
LDI R16,((1<<SIGRD)|(1<<SPMEN)) ; We need to set SIGRD and SPMEN
together
OUT SPMCSR,R16
; and execute the LPM within 3 cycles
LPM R16,Z
RET
Table 19-3.
Parameter Signature Row Address vs. Product
ATtiny261
ATtiny461
ATtiny861
TS_OFFSET
0x1F
0x05
0x05
TS_GAIN
0x1E
0x07
0x07
T
ADCH << 8
〈〉 I ADCL
[]
273
25
TS_OFFSET
–
+
〈〉
–
() 128
×
TS_GAIN
----------------------------------------------------------------------------------------------------------------------------------------------------------------------
25
+
=



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