PCF2111CP datasheet(9/24 Pages) PHILIPS

9 / 24 page

1997 Mar 28

Philips Semiconductors

Product speciﬁcation

LCD drivers

PCF21xxC family

FUNCTIONAL DESCRIPTION

An LCD segment or LED output is activated when the

corresponding DATA bit is HIGH.

7.1

PCF2100C

When DATA bit 21 is HIGH, the A-latches (BP1) are

loaded. With DATA bit 21 LOW, the B-latches (BP2) are

loaded. CLB pulse 23 transfers data from the shift register

to the selected latches.

7.2

PCF2111C

When DATA bit 33 is HIGH, the A-latches (BP1) are

loaded. With DATA bit 33 LOW, the B-latches (BP2) are

loaded. CLB pulse 35 transfers data from the shift register

to the selected latches.

7.3

PCF2112C

When DATA bit 33 is HIGH, the latches are loaded.

CLB pulse 35 transfers data from the shift register to the

selected latches.

7.4

Bus control logic

The following tests are carried out by the bus control logic:

1. Test on leading zero

2. Test on number of DATA bits

3. Test of disturbed DLEN and DATA signals during

transmission.

If one of the test conditions is not fulfilled, no action follows

the load condition (load pulse with DLEN LOW) and the

driver is ready to receive new data.

Fig.7 CBUS data format.

handbook, full pagewidth

DLEN

CLB

DATA

S31

S19

678

PCF2111C and PCF2112C

PCF2100C

PCF2111C and PCF2112C

load bit

load pulse

leading zero

test leading zero

S32

S20

PCF2100C

bit number

output

MLD296

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