upd161608 Renesas Electronics Corporation., upd161608 Datasheet - Page 54

• Manufacturer Part Number: upd161608
• Description: 176-rgb X 220-dot 1-chip Driver Ic For 262,144-color Tft-lcd Display
• Manufacturer: Renesas Electronics Corporation.

17. LADDER RESISTOR / 8 TO 1 SELECTOR
networks including variable resistor and the 8 to 1 selector selecting voltage generated by the ladder resistor network.
The gamma resistor controls the variable and 8 to 1 resistors. Also, there is a pin connected to the external volume
resistor. And it can compensate the dispersion of length between one panel to another.
17.1 Variable Resistor
adjustment (VRP(N)0), and for the amplitude adjustment (VRP(N)1). The resistance value is set by the gray-scale
adjusting resistor (1), (2), reference adjustment resistor, and the oscillation-adjusting resistor as below.
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The ladder resistor / 8 to 1 selector outputs the reference voltage of the gray-scale voltage. There are two ladder resistor
There are 3 types of the variable resistors that is for the gray-scale adjustment (VRHP(N)/VRLP(N)), for reference
Register Value PRP(N)0 [2:0]
Register Value PRP(N)1 [2:0]
Register Value VRP(N)0 [3:0]
0000
0001
0010
1101
1110
1111
000
001
010
011
100
101
110
111
000
001
010
011
100
101
110
111
:
Table 17−1. Gray-scale Adjustment (1)
Table 17−2. Gray-scale Adjustment (2)
Table 17−3. Reference Adjustment
Data Sheet S17594EJ2V0DS
Resistance Value VRHP(N)
Resistance Value VRLP(N)
Resistance Value VRP(N)0
Step = 1R
12R
16R
20R
24R
28R
12R
16R
20R
24R
28R
0R
4R
8R
0R
4R
8R
26R
28R
30R
0R
2R
4R
:
:
μ
PD161608