STE2004S Datasheet, PDF (11/79 Pages) STMicroelectronics – 102 x 65 single-chip LCD controller/driver

STE2004S
Circuit description
Figure 6. Bias level generator
R
V_LCD
n+3
n + 4 ^·VLCD
R
n+2
n + 4 ^·VLCD
nR
2
n + 4 ^·VLCD
R
1
n + 4 ^·VLCD
R
V_{SS D00IN1150}
providing an 1/(n+4) ratio, with n calculated from:
n= m – 3
For m = 65, n = 5, a 1/9 ratio is set.
For m = 49, n =4, a 1/8 ratio is set.
The STE2004S provides three bits (BS0, BS1, BS2) for programming the bias ratio as shown
below:
Table 2. Bias ratio programmable bits
BS2
BS1
BS0
n
0
0
0
7
0
0
1
6
0
1
0
5
0
1
1
4
1
0
0
3
1
0
1
2
1
1
0
1
1
1
1
0
The following table shows the bias level for m = 65 and m = 49:
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