Datasheet

© 2008 Microchip Technology Inc. DS22103A-page 11
MCP23018/MCP23S18
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)
01150.0625
0.113
0.00 0.14
13130.1875
0.338
0.32 0.36
25110.3125
0.563
0.54 0.59
3790.4375
0.788
0.77 0.81
4970.5625
1.013
0.99 1.04
511 50.6875
1.238
1.22 1.26
613 30.8125
1.463
1.44 1.49
715 10.9375
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)
01150.0625
0.169
0.00 0.19
13130.1875
0.506
0.48 0.53
25110.3125
0.844
0.82 0.87
3790.4375
1.181
1.16 1.20
4970.5625
1.519
1.50 1.54
511 50.6875
1.856
1.83 1.88
613 30.8125
2.194
2.17 2.22
715 10.9375
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)
01150.0625
0.344
0.00 0.37
13130.1875
1.031
1.01 1.05
25110.3125
1.719
1.70 1.74
3790.4375
2.406
2.38 2.43
4970.5625
3.094
3.07 3.12
511 50.6875
3.781
3.76 3.80
613 30.8125
4.469
4.45 4.49
715 10.9375
5.156
5.13 5.50
10% Tolerance (total)
10% Tolerance (total)
10% Tolerance (total)
10% Tolerance (total)