UPD16488AP datasheet(13/91 Pages) NEC

13 / 91 page

Data Sheet S15745EJ2V0DS

µµµµPD16488A

3.3

Driver-Related Pins

Symbol

Name

Pad No.

I/O

Description

SEG1 to

SEG128

Segment

347-220

Output

Segment output pins

COM1 to

COM92

Common

166 to 192, 200 to 218,

350 to 368, 375 to 401

Output

Common output pins

VRS

Op amp input pin

for regulating the

driving voltage of

the LCD

7, 8

Input

VRS is an op amp input pin for regulating the driving voltage of

the LCD. This is a reference voltage input for the LCD voltage

regulation amplifier.

When using the internal drive circuit (i.e., when OP1 = 1), we

recommend inserting a 0.1 to 1

µF capacitor between this pin

and GND.

Input pin for the op

amp's feedback

connection

13, 14

Input

VR is an input for the op amp's feedback connection. Insert this

pin between GND and AMPOUT when using the feedback resistor

for this input.

This pin is valid only when not using an internal resistor for VLCD

voltage regulation (i.e., when IRS = L). This pin cannot be used

when using the internal resistor for VLCD voltage regulation (i.e.,

when IRS = H).

AMPOUT

9, 10

AMPOUTP

Op amp output

11, 12

Output

These are op amp output pins for regulating the driving voltage

of the LCD. When not using an internal resistor for VLCD voltage

regulation (i.e., when IRS = L), these outputs are connected to

the LCD drive voltage regulation resistor (see 5.6.2 Voltage

regulator).

We recommend inserting a 0.01 to 0.1

µF capacitor between

these pins in order to stabilize the internal op amp's output.

DUMMY

Dummy pin

1 to 5, 109, 114, 119,

124, 129, 138, 141,

142, 159 to 165,

193 to 199, 219, 348,

349, 369 to 374, 402,

403

−

Dummy pin.

These pins are not connected inside IC. Usually, leave these

pins open.

3.4

Test Pins

Symbol

Name

Pad No.

I/O

Description

TSTIFS

TSTRTST

TSTVIHL

Test input

152, 153,

154, 155,

156, 157

Input

These pins are used to set a test mode for the IC.

Normally, connect these pins to VSS.

TESTOUT

Test output

150, 151

Output

These pins are used when the IC is in test mode.

Usually, leave them open.

UPD16488AP Datasheet(PDF) 13 Page - NEC

UPD16488AP Datasheet(HTML) 13 Page - NEC

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