Datasheet

MCP23009/MCP23S09
DS22121B-page 10 © 2009 Microchip Technology Inc.
FIGURE 1-3: VOLTAGE AND CODE EXAMPLE
Assume:
n = A2, A1, A0 in opcode
ratio = R2/(R1+R2)
V2 = voltage on ADDR pin
V2(min) = V2 - (VDD/8) x %tolerance
V2(max) = V2 + (VDD/8) x %tolerance
V
DD= 1.
8
n R2=2n+1 R1=16-R2 R2/(R1+R2) V2 V2(min) V2(max)
0 1 15 0.0625
0.113
0.00 0.14
1 3 13 0.1875
0.338
0.32 0.36
2 5 11 0.3125
0.563
0.54 0.59
3790.4375
0.788
0.77 0.81
4970.5625
1.013
0.99 1.04
5 11 5 0.6875
1.238
1.22 1.26
6 13 3 0.8125
1.463
1.44 1.49
7 15 1 0.9375
1.688
1.67 1.80
V
DD= 2.
7
n R2=2n+1 R1=16-R2 R2/(R1+R2) V2 V2(min) V2(max)
0 1 15 0.0625
0.169
0.00 0.19
1 3 13 0.1875
0.506
0.48 0.53
2 5 11 0.3125
0.844
0.82 0.87
3790.4375
1.181
1.16 1.20
4970.5625
1.519
1.50 1.54
5 11 5 0.6875
1.856
1.83 1.88
6 13 3 0.8125
2.194
2.17 2.22
7 15 1 0.9375
2.531
2.51 2.70
VDD= 3.3
n R2=2n+1 R1=16-R2 R2/(R1+R2) V2 V2(min) V2(max)
0 1 15 0.0625
0.206
0.00 0.23
1 3 13 0.1875
0.619
0.60 0.64
2 5 11 0.3125
1.031
1.01 1.05
3790.4375
1.444
1.42 1.47
4970.5625
1.856
1.83 1.88
5 11 5 0.6875
2.269
2.25 2.29
6 13 3 0.8125
2.681
2.66 2.70
7 15 1 0.9375
3.094
3.07 3.30
VDD= 5.5
n R2=2n+1 R1=16-R2 R2/(R1+R2)
V
2
V
2(min)
V
2(max)
0 1 15 0.0625
0.344
0.00 0.37
1 3 13 0.1875
1.031
1.01 1.05
2 5 11 0.3125
1.719
1.70 1.74
3790.4375
2.406
2.38 2.43
4970.5625
3.094
3.07 3.12
5 11 5 0.6875
3.781
3.76 3.80
6 13 3 0.8125
4.469
4.45 4.49
7 15 1 0.9375
5.156
5.13 5.50
10% Tolerance (total)
10% Tolerance (total)
10% Tolerance (total)
10% Tolerance (total)