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ML9059E Datasheet(Fiches technique) 34 Page - List of Unclassifed Manufacturers

Numéro de pièce ML9059E
Description  132-Channel LCD Driver with Built-in RAM for LCD Dot Matrix Displays
Télécharger  72 Pages
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Fabricant  ETC2 [List of Unclassifed Manufacturers]
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FEDL9059E-01
LAPIS Semiconductor
ML9059E
34/72
(b) When external resistors are used (voltage V1 adjustment internal resistors are not used)
It is also possible to set the LCD drive power supply voltage V1 without using the internal resistors for voltage V1
adjustment but connecting external resistors (Ra' and Rb') between VSS & VR and between VR & V1. Even in this
case, it is possible to control the LCD power supply voltage V1 and adjust the intensity of LCD display using
commands if the electronic potentiometer function is used.
The voltage V1 can be obtained by the following equation B-1 in the range of V1<VOUT by setting the external
resistors Ra' and Rb' appropriately.
V1 = (1 + (Rb'/Ra'))
 VEV = (1 + (Rb'/Ra'))  (1 – (/324))  VREG (Eqn. B-1)
+
VSS
V1
External Ra'
External Rb'
VEV (Constant voltage supply +
electronic potentiometer)
VR
Fig. 10 V1 voltage adjustment circuit (equivalent circuit)
Setting example: Setting V1 = 7 V at Tj = 25°C
When the electronic potentiometer register value is set to the middle value of (DB5, DB4, DB3, DB2, DB1, DB0)
= (1, 0, 0, 0, 0, 0), the value of
 will be 31 and that of VREG will be 3.0 V, and hence the equation B-1 becomes
as follows:
V1 = (1 + (Rb'/Ra'))
 (1 – (/324))  VREG
7 = (1 + (Rb'/Ra'))
 (1 – (31/324))  3.0 (Eqn. B-2)
Further, if the current flowing through Ra' and Rb' is set as 5 µA, the value of Ra' + Rb' will be - Ra' + Rb' = 1.4
M
 (Eqn. B-3)
and hence,
Rb'/Ra' = 1.58, Ra' = 543 k
, Rb' = 857 k.
In this case, the variability range of voltage V1 using the electronic potentiometer function will be as given in
Table 13.
Table 13 Example 1 of V1 variable-voltage range using electronic potentiometer function
V1
Min
Typ
Max
Unit
Variable-voltage range
6.24 (
 = 63)
7.0 (
 = 31)
7.74 (
 = 0)
[V]




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