SL20T0081 View Datasheet(PDF) - System Logic Semiconductor
Part Name
Description
MFG CO.
'SL20T0081' PDF : 56 Pages View PDF
SLS System Logic Semiconductor
SL20T0081
In Case of Using External Resistors, Ra and Rb (INTRS =“L”)
When INTRS pin is “L”, it is necessary to connect external regulator resistor Ra between VR and VSS, and Rb
between V0 and VR.
Example : For the following requirements
1. LCD driver voltage, V0 = 10V
2. 6-bit reference voltage register = (1, 0, 0, 0, 0, 0)
3. Maximum current flowing Ra, Rb = 1uA
From Eq.1 and Eq.2
Rb
10 = ( 1 +
Ra
) x VEV
[V]
(63 -32 )
VEV = ( 1 - 162 ) x 2.1 ≅ 1.698 [V]
From requirement 3
10
= 1 [uA]
Ra + Rb
(Eq.3)
(Eq.4)
(Eq.5)
From equations Eq.3, 4 and 5
Ra ≅ 1.69 [MΩ]
Rb ≅ 8.31 [MΩ]
The following table shows the range of V0 depending on the above requirements.
Table 12. V0 Depending on Electronic Volume Level
Electronic volume level
0
… ...
32
… ...
63
V0
7.57
… ...
10.00
… ...
12.43
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