PCF8537 datasheet(17/82 Pages) NXP

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PCF8537

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Product data sheet

Rev. 1 — 31 May 2012

17 of 82

NXP Semiconductors

PCF8537

Industrial LCD driver for multiplex rates up to 1:8

8.2 Start-up and shut-down

8.2.1 Power-On Reset (POR)

At power-on, the PCF8537 resets to starting conditions as follows:

1. All backplane and segment outputs are set to VSS.

2. Selected drive mode is: 1:8 with 1⁄4 bias.

3. Input and output bank selectors are reset.

4. The I2C-bus and SPI-bus interface are initialized.

5. The data pointer is cleared (set logic 0).

6. The internal oscillator is running; no clock signal is available on pin CLK; pin CLK is in

3-state.

7. Temperature measurement is enabled.

8. Temperature filter is disabled.

9. The internal VLCD voltage generation is disabled. The charge pump is switched off.

10. The VLCD temperature compensation is enabled.

11. The display is disabled.

The reset state is as shown in Table 23.

Remark: Do not transfer data on the I2C-bus or SPI-bus for at least 1 ms after a power-on

reset to allow the reset action to complete.

Table 23.

Reset state

Reset state of configuration bits shown in the command table format for clarity. The bit labeled with - has an undefined reset

state.

Command name

Bits

Oscillator-ctrl

110

011

COE = 0

OSC = 0

Charge-pump-ctrl

CPE = 0

CPC = 0

Temp-msr-ctrl

110

010

TCE = 1

TME = 1

Temp-comp

000

11SLA[2:0] = 000

001

00SLB[2:0] = 000

001

01SLC[2:0] = 000

001

10SLD[2:0] = 000

Set-VPR

VPR[7:4] = 0000

VPR[3:0] = 0000

Display-enable

001

110

0E = 0

Set-MUX-mode

000

00M[2:0] = 000

Set-bias-mode

B[1:0] = 00

Load-data-pointer

P[5:0] is undefined

Frame-frequency

F[4:0] = 01110

Bank-select

IBS = 0

OBS = 0

Invmode_ctrl

LF = 0

Temp-filter

110

100

1TFE = 0

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