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ML9058E Datasheet(PDF) 35 Page - LAPIS Semiconductor Co., Ltd. |
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ML9058E Datasheet(HTML) 35 Page - LAPIS Semiconductor Co., Ltd. |
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35 / 76 page  FEDL9058E-01 LAPIS Semiconductor ML9058E 35/76 (c) When external resistors are used (voltage V1 adjustment internal resistors are not used) and a variable resistor is also used It is possible to set the LCD drive power supply voltage V1 using fine adjustment of Ra' and Rb' by adding a variable resistor to the case of using external resistors in the above case. 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 C-1 in the range of V1<VOUT by setting the external resistors R1, R2 (variable resistor), and R3 appropriately and making fine adjustment of R2 (R2). V1 = (1 + (R3 + R2 – R2)/(R1 + R2)) VEV = (1 + (R3 + R2 – R2)/(R1 + R2)) (1 – (/324)) VREG (Eqn. C-1) Fig. 11 V1 voltage adjustment circuit (equivalent circuit) Setting example: Setting V1 in the range 5 V to 9 V using R2 at Tj = 25°C . When the electronic potentiometer register value is set to (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 in order to make V1 = 9 V when R 2 = 0, the equation C-1 becomes as follows: 9 = (1 + (R3 + R2)/R1) (1 – (31/324)) (3.0) (Eqn. C-2) In order to make V1 = 5 V when R 2 = R2, 5 = (1 + R3/(R1+R2)) (1 – (31/324)) (3.0) (Eqn. C-3) Further, if the current flowing between VSS and V1 is set as 5 µA, the value of R1 + R2 + R3 becomes- R1 + R2 + R3 = 1.8 M (Eqn. C-4) and hence, R1 = 542 k, R2 = 436 k, R3 = 822 k. In this case, the variability range of voltage V1 using the electronic potentiometer function and the increment size will be as given in Table 13. Table 14 Example 2 of V1 variable-voltage range using electronic potentiometer function and variable resistor V1 Min Typ Max Unit Variable-voltage range 4.45 ( = 63) 7.0 ( = 31) 9.96 ( = 0) [V] VEV (Constant voltage supply + electronic potentiometer) + – Rb' Ra' External R3 R 2 VR VSS V1 External R2 External R1 |
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