PCF1179CT,118 Datasheet PCF1179CT,118, PCF1179CT,112 | P4-P6

Product data sheet Rev. 3 — 12 February 2015 4 of 25

NXP Semiconductors

PCF1179C

4-digit duplex LCD car clock

6.2 Pin description

Table 4. Pin description

Symbol Pin Description

S1 1 hour adjustment input

DATA 2 EEPROM data input

OSC_IN 3 oscillator input

OSC_OUT 4 oscillator output

5 negative supply voltage

MODE 6 12/24-hour mode select input

7 programming voltage input

TS 8 test speed-up mode input

ENABLE 9 enable input (for S1 and S2)

10 positive supply voltage

FLASH 11 colon option input

SEL 12 EEPROM select input

S2 13 minute adjustment input

B4/C4 14 segment drivers

G4/D4 15

F4/E4 16

B3/C3 17

G3/A3/D3 18

F3/E3 19

A4/COL 20

B2/C2 21

G2/D2 22

F2/E2 23

B1/C1 24

A2/A1/D1/E1/G1 25

AM/PM 26

BP2 27 backplane 2

BP1 28 backplane 1

Product data sheet Rev. 3 — 12 February 2015 5 of 25

NXP Semiconductors

PCF1179C

4-digit duplex LCD car clock

7. Functional description

7.1 Outputs

Typical displays for the PCF1179C are shown in Figure 3.

The circuit outputs 1:2 multiplexed data (duplex) to the LCD. The segment assignment of

the LCD is show in Figure 4

7.2 LCD voltage

Generation of BP1 and BP2 (three-level backplane signals at V

, V

/2, and 0) and the

output signals are shown in Figure 5

Fig 3. Typical displays for the PCF1179C

Fig 4. Segment assignment of the LCD

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Product data sheet Rev. 3 — 12 February 2015 6 of 25

NXP Semiconductors

PCF1179C

4-digit duplex LCD car clock

The average voltages across the segments are:

1. V

ON(RMS)

=0.79V

2. V

OFF(RMS)

=0.35V

For a good contrast, the adjustable voltage regulator controls the supply voltage (see

Figure 6

and Section 7.13) in relation to temperature. For example, when V

=4.5V

at +25 C, then:

• V

=3 Vto4V at+85C

• V

=5 Vto6V at40 C

Fig 5. Backplane and segment output signals

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P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P25

PCF1179CT,118

Mfr. #:

Buy PCF1179CT,118

Manufacturer:

NXP Semiconductors

Description:

LCD Drivers 4 DIG DUPLX LCD CLCK

Lifecycle:

New from this manufacturer.

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PCF1179CT,118

PCF1179CT,118

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