TMP86FS28DFG datasheet(210/272 Pages) TOSHIBA

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Page 198

16. LCD Driver

16.2 Control

TMP86FS28DFG

Note 1: When the TMP86FS28DFG uses the booster circuit to drive the LCD, the power supply and capacitor for the booster cir-

cuit should be connected as shown above.

Note 2: When the reference voltage is connected to a pin other than V1, add a capacitor between V1 and GND.

Note 3: The connection examples shown above are different from those shown in the datasheets of the previous version. Since

the above connection method enhances the boosting characteristics, it is recommended that new boards be designed

using the above connection method. (Using the existing connection method does not affect LCD display.)

Figure 16-3 Connection Examples When Using the Booster Circuit (LCDCR<BRES> = “1”)

Note 1: The current capacity is the amount of voltage that falls per 1

µA.

Note 2: The boosting frequency should be selected depending on your LCD panel.

Note 3: For the reference pin V1 or V2, a current capacity ten times larger than the above is recommended to ensure stable oper-

ation.

For example, when the boosting frequency is fc/29 (at fc = 8 MHz),

−1.7 mV/ µA or more is recommended for the current

capacity of the reference pin V1.

16.2.3.2 When using an external resistor divider (LCDCR<BRES>="0")

When an external resistor divider is used, the voltage of an external power supply is divided and input

on V1, V2, and V3 to generate the output voltages for segment/common signals.

Table 16-3 V3 Pin Current Capacity and Boosting Frequency (typ.)

VFSEL

Boosting frequency

fc = 16 MHz

fc = 8 MHz

fc = 4 MHz

fc = 32.768 MHz

fc/213 or fs/25

−37 mV/ µA

−80 mV/ µA

−138 mV/ µA

−76 mV/ µA

fc/211 or fs/23

−19 mV/ µA

−24 mV/ µA

−37 mV/ µA

−23 mV/ µA

fc/210 or fs/22

−17 mV/ µA

−19 mV/ µA

−24 mV/ µA

−18 mV/ µA

fc/29

−16 mV/ µA

−17 mV/ µA

−19 mV/ µA–

VDD

VSS

Keep the following

condition.

= 0.1 to 0.47

µF

c) Reference pin = V3

Reference voltage

VDD

VSS

Keep the following

condition.

= 0.1 to 0.47

µF

d) Reference pin = V3

V3 =

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