PCF8545ATT datasheet(13/103 Pages) NXP

13 / 103 page

PCA8530

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Product data sheet

Rev. 2 — 25 September 2014

13 of 103

NXP Semiconductors

PCA8530

Automotive 102 x 4 Chip-On-Glass LCD segment driver

8.2.7 Command: Status-readout

The Status-readout command offers to readout some status bits of the PCA8530. These

bits indicate the status of the device at the moment of reading.

[1]

The flag is set whenever a reset occurs, induced by RST pin, Power-On Reset (POR), or Initialize

command. After power-on, the flag is set and should be cleared for reset monitoring.

Some bits of the Status-readout command have a certain probability of being changed by

an EMC/ESD event. For example, an EMC/ESD event can cause a change of the

hard-wired settings of SA1 or SA0. Therefore SR[3:0] can help to detect if an EMC/ESD

event has occurred which has caused the change of a bit. In environments where

EMC/ESD events may occur, it could be helpful to compare the result of the

Status-readout command with the initial bit settings periodically.

Table 12.

Status-readout - status and temperature read command bit description

For this command, bit R/W has to be set logic 1.

Bit

Symbol

Value

Description

-R/W

fixed value

RS[1:0]

fixed value

Temperature readout if SO = 0 (see Table 11)

7 to 0

TD[7:0]

00000000 to

11111111

temperature readout (see Section 8.10.4.1 on

page 40)

Device status readout if SO = 1 (see Table 11)

7SR7

display status (see Table 22 on page 21)

display is disabled

display is enabled

6SR6

charge pump switching status

(status of bit CPE, see Table 14 on page 15)

charge pump disabled

charge pump enabled

5SR5

charge pump charge status

charge pump has not reached programmed

value

charge pump has reached programmed value

4SR4

reset status flag

no reset has occurred since the reset status

flag was cleared last time

reset has occurred since the reset status flag

was cleared last time[1]

3 to 0

SR[3:0]

EMC detection

01SA1SA0

pre-defined code for EMC detection when I2C

interface is used

0101

pre-defined code for EMC detection when SPI

interface is used

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