AMC7812 Datasheet, PDF (63/92 Pages) Texas Instruments – 12-Bit ANALOG MONITORING AND CONTROL SOLUTION with Multichannel ADC, DACs, and Temperature Sensors

AMC7812
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SBAS513D – JANUARY 2011 – REVISED OCTOBER 2012
η-FACTOR CORRECTION REGISTER (Read/Write, Addresses = 21h and 22h)
Only the low byte is used; the high byte is ignored.
When using the SPI interface, the following bit configuration must be used; (Default = 0000h).
MSB
BIT 15 BIT 14 BIT 13 BIT 12 BIT 11 BIT 10
0
0
0
0
0
0
BIT 9
0
BIT 8
0
BIT 7
BIT 6
BIT 5
BIT 4 BIT 3
N_ADJUST
BIT 2
BIT 1
LSB
BIT 0
When using the I²C, the following bit configuration must be used; (Default = 00FFh).
MSB
BIT 15 BIT 14 BIT 13 BIT 12 BIT 11 BIT 10
N_ADJUST
BIT 9
BIT 8
BIT 7
1
BIT 6
1
BIT 5
1
BIT 4
1
BIT 3
1
BIT 2
1
BIT 1
1
LSB
BIT 0
1
The N_ADJUST value for ideality correction is stored as shown in Table 14. η_EFF is the actual ideality of the
transistor being used. Refer to the Ideality Factor section for more details.
BINARY
0111 1111
0000 1010
0000 1000
0000 0110
0000 0100
0000 0010
0000 0001
0000 0000
1111 1111
1111 1110
1111 1100
1111 1010
1111 1000
1111 0110
1000 0000
Table 14. N_ADJUST and η_EFF Values
N_ADJUST
HEX
DECIMAL
7F
127
0A
10
08
8
06
6
04
4
02
2
01
1
00
0
FF
–1
FE
–2
FC
–4
FA
–6
F8
–8
F6
–10
80
–128
η_EFF
1.747977
1.042759
1.035616
1.028571
1.021622
1.014765
1.011371
1.008 (Default)
1.004651
1.001325
0.994737
0.988235
0.981818
0.975484
0.706542
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