SN8P1829
8-Bit MCU build-in 12-bit ADC + PGIA + Charge-pump Reg 128 dots LCD driver
SONiX TECHNOLOGY CO., LTD
Page 123
Version 1.0
PROGRAMMABLE GAIN INSTRUMENTATION AMPLIFIER
(PGIA)
SN8P1829 includes a low noise chopper-stabilized programmable gain instrumentation amplifier (PGIA) with selectable
gains stage one of16x, 32x, 64x, 128x and gains stage two of 1.3x ~ 2.5x by register PGIAM.
PGIAM- PGIA Mode Register
09AH
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PGIAM
P2GS3 P2GS2 P2GS1 P2GS0
-
P1GS1 P1GS0
PGIAENB
R/W R/W R/W R/W - R/W
R/W
R/W
PGIAENB:
PGIA function enable control bit.
0 = Disable PGIA function
1 = Enable PGIA function
P1GS [1:0]:
PGIA Gain1 selection control bit
P2GS [3:0]:
PGIA Gain2 selection control bit
P1GS [1:0]
00
01
10
11
P2GS [3:0]
Gain
16
32
64
128
0000
1.32558
21.2093 42.4186
84.8372
169.674
0001
1.38095
22.0952 44.1905
88.381 176.762
0010
1.43902
23.0244 46.0488
92.0976
184.195
0011
1.5
24 48 96 192
0100
1.5641
25.0256 50.0513
100.103
200.205
0101
1.63158
26.1053 52.2105
104.421
208.842
0110
1.7027
27.2432 54.4865
108.973
217.946
0111
1.77778
28.4444 56.8889
113.778
227.556
1000
1.85714
29.7143 59.4286
118.857
237.714
1001
1.94118
31.0588 62.1176
124.235
248.471
1010
2.0303
32.4848 64.9697
129.939
259.879
1011
2.125
34 68 136
272
1100
2.22581
35.6129 71.2258
142.452
284.903
1101
2.33333
37.3333 74.6667
149.333
298.667
1110
2.44828
39.1724 78.3448
156.69 313.379
1111
2.57143
41.1429 82.2857
164.571
329.143
PGIAOUT = [() – (PGIAIN-)] X GAIN1 X GAIN2