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ML9059E Datasheet(PDF) 34 Page - LAPIS Semiconductor Co., Ltd. |
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ML9059E Datasheet(HTML) 34 Page - LAPIS Semiconductor Co., Ltd. |
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34 / 72 page  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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