PCF8545ATT datasheet(7/54 Pages) NXP

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PCA8576F

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Product data sheet

Rev. 3 — 3 December 2014

7 of 54

NXP Semiconductors

PCA8576F

Automotive 40 × 4 LCD driver

7.1.4 Command: bank-select

[1]

The bank-select command has no effect in 1:3 and 1:4 multiplex drive modes.

7.1.5 Command: blink-select

[1]

Normal blinking is assumed when the LCD multiplex drive modes 1:3 or 1:4 are selected.

[2]

Alternate RAM bank blinking does not apply in 1:3 and 1:4 multiplex drive modes.

7.2 Clock and frame frequency

7.2.1 Internal clock

The internal logic of the PCA8576F and its LCD drive signals are timed either by its

internal oscillator or by an external clock. The internal oscillator is enabled by connecting

pin OSC to pin VSS. If the internal oscillator is used, the output from pin CLK can be used

as the clock signal for several PCA8576Fs in the system that are connected in cascade.

7.2.2 External clock

Pin CLK is enabled as an external clock input by connecting pin OSC to VDD. The LCD

frame signal frequency is determined by the clock frequency (fclk).

Table 10.

Bank-select command bit description

See Section 7.3.8.2 and Section 7.3.8.3.

Bit

Symbol

Value

Description

Static

1:2 multiplex[1]

0, 1

see Table 6

6 to 2

11110

fixed value

input bank selection; storage of arriving display data

RAM row 0

RAM rows 0 and 1

RAM row 2

RAM rows 2 and 3

output bank selection; retrieval of LCD display data

RAM row 0

RAM rows 0 and 1

RAM row 2

RAM rows 2 and 3

Table 11.

Blink-select command bit description

See Section 7.2.4.

Bit

Symbol

Value

Description

0, 1see Table 6

6 to 3

1110

fixed value

2AB

blink mode selection

normal blinking[1]

alternate RAM bank blinking[2]

1 to 0

BF[1:0]

blink frequency selection

off

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