Datasheet PCF1175CT-F2, PCF1175CU, PCF1175CU-10-F2, PCF1175CU-5-F2 Datasheet (Philips)

DATA SH EET

Product specification
Supersedes data of September 1993
File under Integrated Circuits, IC16

1997 Apr 16

INTEGRATED CIRCUITS

PCF1175C

4-digit duplex LCD car clock

1997 Apr 16 2

Philips Semiconductors Product specification

4-digit duplex LCD car clock PCF1175C

FEATURES

• Internal voltage regulator is electrically programmable
for various LCD voltages

• Time calibration is electrically programmable
(no trimming capacitor required)

• LCD voltage adjusts with temperature for good contrast

• 4.19 MHz oscillator

• 12-hour or 24-hour mode

• Operating ambient temperature: −40 to +85 °C

• 28-lead plastic SMD (SO28)

• 1 Hz set mode.

GENERAL DESCRIPTION

The PCF1175C is a single chip, 4.19 MHz CMOS car clock
circuit providing hours, minutes and seconds functions.
It is designed to drive a 4-digit duplex liquid crystal display
(LCD).

Two external single-pole, single-throw switches will
accomplish all time setting functions. Time calibration and
voltage regulator are electrically programmable via an
on-chip EEPROM. The circuit is battery-operated via an
internal voltage regulator and an external resistor.

ORDERING INFORMATION

Notes

1. See Fig.1 and Chapter “Package outline” for pin layout and package details.

2. See Chapter “Chip dimensions and bonding pad locations” for pad layout and package details.

TYPE

NUMBER

PACKAGE

NAME DESCRIPTION VERSION

PCF1175CT SO28 plastic small outline package; 28 leads; body width 7.5 mm

(1)

SOT136-1

PCF1175CU − uncased chip in tray

(2)

−

PCF1175CU/10 − chip-on-film frame carrier (FFC)

(2)

−

1997 Apr 16 3

Philips Semiconductors Product specification

4-digit duplex LCD car clock PCF1175C

PINNING

SYMBOL PIN DESCRIPTION

S1 1 hour adjustment input
DATA 2 EEPROM data input
OSC IN 3 oscillator input
OSC OUT 4 oscillator output
V

SS

5 negative supply voltage
MODE 6 12/24-hour mode select input
V

PP

7 programming voltage input
TS 8 test speed-up mode input
ENABLE 9 enable input (for S1 and S2)
V

DD

10 positive supply voltage
FLASH 11 colon option input
SEL 12 EEPROM select input
S2 13 minute adjustment input
B4/C4 14 segment driver
G4/D4 15 segment driver
F4/E4 16 segment driver
B3/C3 17 segment driver
G3/AD3 18 segment driver
F3/E3 19 segment driver
A4/COL 20 segment driver
B2/C2 21 segment driver
G2/D2 22 segment driver
F2/E2 23 segment driver
B1/C1 24 segment driver
A2/ADEG1 25 segment driver
AM/PM 26 segment driver
BP2 27 backplane 2
BP1 28 backplane 1

Fig.1 Pin configuration, PCF1175CT, (SO28).

1
2
3
4
5
6
7
8

9
10
11
12
13

28
27
26
25
24
23
22
21
20
19
18
17
16
1514

PCF1175CT

S1

DATA

OSC OUT

SS

MODE

PP
TS

ENABLE

DD

FLASH

SEL

S2

B4/C4

V

V

V

OSC IN

G4/D4

F4/E4

B3/C3

G3/AD3

F3/E3

A4/COL

B2/C2

G2/D2

F2/E2

B1/C1

A2/ADEG1

AM/PM

BP2

BP1

MSB222

1997 Apr 16 4

Philips Semiconductors Product specification

4-digit duplex LCD car clock PCF1175C

FUNCTIONAL DESCRIPTION AND TESTING
Outputs

The circuit outputs 1 : 2 multiplexed data (duplex) to the
LCD. Generation of BP1 and BP2 (three-level backplane
signals) and the output signals are shown in Fig.4.

The average voltages across the segments are:

1. V

ON(RMS)

= 0.79 V

DD

2. V

OFF(RMS)

= 0.35 VDD.

Fig.2 Segment designation of LCD.

MSA992

A2

G2

D2

F2

E2

B2

C2

P1 (P3)

P2 (P4)

A3

G3

D3

F3

E3

B3

C3

A4

G4

D4

F4

E4

B4

C4

AM

PM

A1

G1

D1

E1

B1

C1

Fig.3 Typical displays.

a. 12-hour mode.

b. 24-hour mode.

PM

TIME

MSA993

(a)

MSA994

TIME

(b)

Fig.4 Backplane and output signals.

MSB226

V

DD

VDD/2

0

BP1

V

DD

VDD/2

0

BP2

V

DD

0

SEGMENT1SEGMENT

2

ON ON

V

DD

0

OFF ON

V

DD

0

ON OFF

V

DD

0

OFF OFF

15.625 ms

1997 Apr 16 5

Philips Semiconductors Product specification

4-digit duplex LCD car clock PCF1175C

LCD voltage (see Fig.5)
The adjustable voltage regulator controls the supply

voltage (see Section “LCD voltage programming”) in
relation to temperature for good contrast, for example
when VDD= 4.5 V at +25 °C, then:

VDD= 3 to 4 V at +85 °C.
VDD= 5 to 6 V at −40 °C.

Fig.5 Regulated voltage as a function of temperature (typical).

(1) Programmed to 4.0 V at 25 °C (value within the specified operating range).
(2) Programmed to 4.5 V at 25 °C (value within the specified operating range).
(3) Programmed to 5.0 V at 25 °C (value within the specified operating range).

40 0 40 120

−8

−6

−2

0

−4

MSA995

80

T ( C)

o

V

SS

(V)

(2)
(1)

(3)

1997 Apr 16 6

Philips Semiconductors Product specification

4-digit duplex LCD car clock PCF1175C

12/24-hour mode

Operation in 12-hour or 24-hour mode is selected by
connecting MODE to VDD or VSS respectively. If MODE is
left open-circuit and a reset occurs, the mode will change
from 12-hour to 24-hour mode or vice versa.

Power-on

After connecting the supply, the start-up mode is:
MODE connected to V

DD

: 12-hour mode, 1:00 AM.
MODE connected to VSS: 12-hour mode, 0:00.
MODE left open-circuit: 24-hour mode, 0:00 or 1:00.

Colon

If FLASH is connected to V

DD

the colon pulses at 1 Hz.

If FLASH is connected to VSS the colon is static.

Time setting

Switch inputs S1 and S2 have a pull-up resistor to facilitate
the use of single-pole, single-throw contacts. A debounce
circuit is incorporated to protect against contact bounce
and parasitic voltages.

Set enable

Inputs S1 and S2 are enabled by connecting ENABLE to
V

DD

or disabled by connecting to VSS.

Set hours

When S1 is connected to V

SS

the hours displayed
advances by one and after one second continues with one
advance per second until S1 is released (auto-increment).

Set minutes

When S2 is connected to V

SS

the time displayed in
minutes advances by one and after one second continues
with one advance per second until S2 is released
(auto-increment). In addition to minute correction, the
seconds counter is reset to zero.

Segment test/reset

When S1 and S2 are connected to V

SS

, all LCD segments
are switched ON. Releasing switches S1 and S2 resets the
display. No reset occurs when DATA is connected to V

SS

(overlapping S1 and S2).

Test mode

When TS is connected to V

DD

, the device is in normal
operating mode. When connecting TS to VSS all counters
(seconds, minutes and hours) are stopped, allowing quick
testing of the display via S1 and S2 (debounce and
auto-increment times are 64 times faster). TS has a
pull-up resistor but for reasons of safety it should be
connected to VDD.

EEPROM

V

PP

has a pull-up resistor but for reasons of safety it should

be connected to VDD.

LCD voltage programming

To enable LCD voltage programming, SEL is set to
open-circuit and a level of V

DD

− 5 V is applied to VPP (see
Fig.6). The first pulse (tE) applied to the DATA input clears
the EEPROM to give the lowest voltage output. Further
pulses (tL) will increment the output voltage by steps of
typically 150 mV (T

amb

=25°C). For programming,
measure VDD− VSS and apply a store pulse (tW) when the
required value is reached. If the maximum number of steps
(n = 31) is reached and an additional pulse is applied the
voltage will return to the lowest value.

Time calibration

To compensate for the tolerance in the quartz crystal
frequency which has been positively offset (nominal
deviation +60 × 10

−6

) by capacitors at the oscillator input
and output, a number (n) of 262144 Hz are inhibited every
second of operation.

1997 Apr 16 7

Philips Semiconductors Product specification

4-digit duplex LCD car clock PCF1175C

The number (n) is stored in a non-volatile memory which is achieved by the following steps (see Fig.6):

1. Set SEL to VSS and a level of VDD− 5 V to V

PP

2. The quartz-frequency deviation ∆f/f is measured and (n) is calculated (see Table 1)

3. A first pulse tE is applied to the DATA input clears the EEPROM to give the highest backplane frequency

4. The calculated pulses (n) are entered in (tH, tL). If the maximum backplane period is reached and an additional pulse
is applied the period will return to the lowest value.

5. The backplane period is controlled and when correct fixed by applying the store pulse t

W

6. Release SEL and VPP.

Table 1 Time calibration (∆t = 7.63 µs; SEL at V

SS

)

OSCILLATOR-FREQUENCY DEVIATION

∆f/f

(× 10

−6

)

NUMBER OF PULSES

(n)

BACKPLANE PERIOD

(ms)

0 0 15.625
+3.8 1 15.633
+7.6 2 15.641

+11.4 3 15.648

...
...
...

+117.8 31 15.861

1997 Apr 16 8

Philips Semiconductors Product specification

4-digit duplex LCD car clock PCF1175C

Fig.6 Programming diagram.

MSB223

PCF1175C

SEL

V

DD

OSC OUT

OSC IN

V

SS

12 V

R

6.8 kΩ

C 47 µF

ext

V

SS

DATA

V

PP

pulse
generators

0 V

t , t = 4 to 6 ms

WE

t = 1 µs

H

t = 1 to 1.5 µs

L

t

E

tHtLtHt

L

V

DD

t

H

t

W

n

clears cells incrementing counters store pulse

5 VV

DD

DATA

V

PP

V

DD
5 VV

DD

50 µs

50 µs

50 µs

50 µs

1997 Apr 16 9

Philips Semiconductors Product specification

4-digit duplex LCD car clock PCF1175C

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

Note

1. Connecting the supply voltage with reverse polarity, will not harm the circuit, provided the current is limited to 10 mA
by an external resistor.

HANDLING

Inputs and outputs are protected against electrostatic discharges in normal handling. However, to be totally safe, it is
advisable to take handling precautions appropriate to handling MOS devices. Advice can be found in

“Data Handbook IC16, General, Handling MOS Devices”

.

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

DD

supply voltage with respect to V

SS

− 8V

I

DD

supply current VSS= 0 V; note 1 − 3mA

V

I

input voltage all pins except VPP and DATA −0.3 VDD+ 0.3 V

pins V

PP

and DATA −3V

DD

+ 0.3 V

T

amb

operating ambient temperature −40 +85 °C

T

stg

storage temperature −55 +125 °C

1997 Apr 16 10

Philips Semiconductors Product specification

4-digit duplex LCD car clock PCF1175C

CHARACTERISTICS

V

DD

=3to6V; VSS=0V; T

amb

= −40 to +85 °C; crystal: f = 4.194304 MHz; Rs=50Ω; CL= 12 pF; maximum

frequency tolerance = ±30 × 10

−6

; unless otherwise specified.

Note

1. A suitable resistor (R) must be selected (example):
a) V

DD

= 5 V; R max. (12 V − 5 V)/700 µA=10kΩ.
b) VDD= 5 V; R typ. (12 V − 5 V)/900 µA = 7.8 kΩ (more reserve).
c) IDD must not exceed 3 mA.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

V

DD

supply voltage voltage regulator programmed

to 4.5 V at T

amb

=25°C

3 − 6V

∆V

DD

supply voltage variation S1 or S2 closed −− 50 mV

TC supply voltage variation due to

temperature

−−0.35 − %/K

V

DD

= 4.5 V −−16 − mV/K

I

DD

supply current note 1 700 950 −µA

C

EXT

capacitance external capacitor 47 −−µF

Oscillator

t

osc

start time −− 200 ms

∆f/f frequency deviation nominal n = 0 0 60 × 10

−6

110 × 10

−6

∆f/f frequency stability ∆VDD= 100 mV −− 1×10

−6

R

fb

feedback resistance 300 1000 3000 kΩ

C

i

input capacitance − 16 − pF

C

o

output capacitance − 27 − pF

Inputs

R

O

pull-up resistance S1, S2, TS, SEL and DATA 45 90 180 kΩ

R

O

pull-up/pull-down resistance MODE 100 300 1000 kΩ

I

IL

leakage current ENABLE, FLASH −− 2 µA

t

d

debounce time S1 and S2 only 30 65 100 ms

V

PP

programming voltage

I

O2

output current VPP=VDD− 5V 70 − 700 µA

during programming − 500 −µA

Backplane (high and low levels)

R

BP

output resistance ±100 µA −− 3kΩ

Segment

R

SEG

output resistance ±100 µA −− 5kΩ

LCD

V

offset(DC)

DC offset voltage 200 kΩ/1 nF −− 50 mV

1997 Apr 16 11

Philips Semiconductors Product specification

4-digit duplex LCD car clock PCF1175C

CHIP DIMENSIONS AND BONDING PAD LOCATIONS

Fig.7 Bonding pad locations, PCF1175CU; 28 terminals.

Chip area: 5.61 mm2.
Bonding pad dimensions: 110 µm × 110 µm.
Chip thickness: 381 ±25 µm.

MSB224

0

0

V

SS

MODE

V

PP

TS

ENABLE

V

DD

1.92 mm

FLASH

x

SEL

S2

B4/C4

G4/D4

F4/E4

B3/C3

G3/AD3

PCF1175CU

OSC OUT

OSC IN

DATA

S1

BP1

BP2

AM/PM

A2/ADEG1

2.92 mm

B1/C1yF2/E2

G2/D2

B2/C2

A4/COL

F3/E3

1997 Apr 16 12

Philips Semiconductors Product specification

4-digit duplex LCD car clock PCF1175C

Table 2 Bonding pad locations (dimensions in µm)
All x/y coordinates are referenced to the bottom left pad (V

SS

), see Fig.7.

PAD x y PAD x y

S1 −138 881 G4/D4 1438 1588
DATA −138 639 F4/E4 1438 1808
OSC IN −138 408 B3/C3 1438 2028
OSC OUT −138 188 G3/AD3 1438 2248
V

SS

0 0 F3/E3 1400 2476
MODE 383 0 A4/COL 1000 2476
V

PP

583 0 B2/C2 800 2476
TS 846 0 G2/D2 600 2476
ENABLE 1046 0 F2/E2 400 2476
V

DD

1352 0 B1/C1 0 2476
FLASH 1438 188 A2/ADEG1 −138 2248
SEL 1438 408 AM/PM −138 2028
S2 1438 628 BP2 −138 1808
B4/C4 1438 848 BP1 −138 1588
chip corner (max. value) −355 −175

1997 Apr 16 13

Philips Semiconductors Product specification

4-digit duplex LCD car clock PCF1175C

APPLICATION INFORMATION

Fig.8 Typical application diagram.

(1) To be placed close to the IC.

MSB225

OSC IN

OSC OUT34

OSCILLATOR

AM/PM

COUNTER

HOURS

COUNTER

MINUTES

COUNTER

SECONDS
COUNTER

ADJUSTABLE

DIVIDER

EEPROM

CONTROL

LOGIC

VOLTAGE

REGULATOR

7

V

PP

11 FLASH

8TS
9

ENABLE

S1
S2

1

DATA

SEL

12
2

13
6

5

V

SS

MODE

DECODER

DECODER

BP1 28

26

14

segment drivers

to LCD

PCF1175C

12 V

6.8 kΩ

I

DD

(1)

100 nF

V

DD

C

ext

47 µF

BP2 27

10

1997 Apr 16 14

Philips Semiconductors Product specification

4-digit duplex LCD car clock PCF1175C

PACKAGE OUTLINE

UNIT

A

max.

A

1

A2A

3

b

p

cD

(1)E(1) (1)

eHELLpQ

Z

ywv θ

REFERENCES

OUTLINE
VERSION

EUROPEAN

PROJECTION

ISSUE DATE

IEC JEDEC EIAJ

mm

inches

2.65

0.30

0.10

2.45

2.25

0.49

0.36

0.32

0.23

18.1

17.7

7.6

7.4

1.27

10.65

10.00

1.1

1.0

0.9

0.4

8
0

o
o

0.25 0.1

DIMENSIONS (inch dimensions are derived from the original mm dimensions)

Note

1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.

1.1

0.4

SOT136-1

91-08-13

95-01-24

X

14

28

w M

θ

A

A

1

A

2

b

p

D

H

E

L

p

Q

detail X

E

Z

c

L

v M

A

e

15

1

(A )

3

A

y

0.25

075E06 MS-013AE

pin 1 index

0.10

0.012

0.004

0.096

0.089

0.019

0.014

0.013

0.009

0.71

0.69

0.30

0.29

0.050

1.4

0.055

0.42

0.39

0.043

0.039

0.035

0.016

0.01

0.25

0.01

0.004

0.043

0.016

0.01

0 5 10 mm

scale

SO28: plastic small outline package; 28 leads; body width 7.5 mm

SOT136-1

1997 Apr 16 15

Philips Semiconductors Product specification

4-digit duplex LCD car clock PCF1175C

SOLDERING
Introduction

There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.

This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
our

“IC Package Databook”

(order code 9398 652 90011).

Reflow soldering

Reflow soldering techniques are suitable for all SO
packages.

Reflow soldering requires solder paste (a suspension of
fine solder particles, flux and binding agent) to be applied
to the printed-circuit board by screen printing, stencilling or
pressure-syringe dispensing before package placement.

Several techniques exist for reflowing; for example,
thermal conduction by heated belt. Dwell times vary
between 50 and 300 seconds depending on heating
method. Typical reflow temperatures range from
215 to 250 °C.

Preheating is necessary to dry the paste and evaporate
the binding agent. Preheating duration: 45 minutes at
45 °C.

Wave soldering

Wave soldering techniques can be used for all SO
packages if the following conditions are observed:

• A double-wave (a turbulent wave with high upward
pressure followed by a smooth laminar wave) soldering
technique should be used.

• The longitudinal axis of the package footprint must be
parallel to the solder flow.

• The package footprint must incorporate solder thieves at
the downstream end.

During placement and before soldering, the package must
be fixed with a droplet of adhesive. The adhesive can be
applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the
adhesive is cured.

Maximum permissible solder temperature is 260 °C, and
maximum duration of package immersion in solder is
10 seconds, if cooled to less than 150 °C within
6 seconds. Typical dwell time is 4 seconds at 250 °C.

A mildly-activated flux will eliminate the need for removal
of corrosive residues in most applications.

Repairing soldered joints

Fix the component by first soldering two diagonally­opposite end leads. Use only a low voltage soldering iron
(less than 24 V) applied to the flat part of the lead. Contact
time must be limited to 10 seconds at up to 300 °C. When
using a dedicated tool, all other leads can be soldered in
one operation within 2 to 5 seconds between
270 and 320 °C.

1997 Apr 16 16

Philips Semiconductors Product specification

4-digit duplex LCD car clock PCF1175C

DEFINITIONS

LIFE SUPPORT APPLICATIONS

These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.

Data sheet status

Objective specification This data sheet contains target or goal specifications for product development.
Preliminary specification This data sheet contains preliminary data; supplementary data may be published later.
Product specification This data sheet contains final product specifications.

Limiting values

Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.

Application information

Where application information is given, it is advisory and does not form part of the specification.

1997 Apr 16 17

Philips Semiconductors Product specification

4-digit duplex LCD car clock PCF1175C

NOTES

1997 Apr 16 18

Philips Semiconductors Product specification

4-digit duplex LCD car clock PCF1175C

NOTES

1997 Apr 16 19

Philips Semiconductors Product specification

4-digit duplex LCD car clock PCF1175C

NOTES

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© Philips Electronics N.V. 1997 SCA54
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Belgium: see The Netherlands
Brazil: seeSouth America
Bulgaria: Philips Bulgaria Ltd., Energoproject, 15thfloor,

51 James Bourchier Blvd., 1407 SOFIA,
Tel. [phone], Fax. [phone]

Canada: PHILIPS SEMICONDUCTORS/COMPONENTS,
Tel. [phone]

China/Hong Kong: 501 Hong Kong Industrial Technology Centre,
72 Tat Chee Avenue, Kowloon Tong, HONG KONG,
Tel. [phone], Fax. [phone]

Colombia: see South America
Czech Republic: see Austria
Denmark: Prags Boulevard 80, PB 1919, DK-2300 COPENHAGEN S,

Tel. [phone], Fax. [phone]
Finland: Sinikalliontie 3, FIN-02630 ESPOO,

Tel. [phone], Fax. [phone]
France: 4 Rue du Port-aux-Vins, BP317, 92156 SURESNES Cedex,

Tel. [phone], Fax. [phone]
Germany: Hammerbrookstraße 69, D-20097 HAMBURG,

Tel. [phone], Fax. [phone]
Greece: No. 15, 25th March Street, GR 17778 TAVROS/ATHENS,

Tel. [phone], Fax. [phone]

Hungary: seeAustria
India: Philips INDIA Ltd, Shivsagar Estate, A Block, Dr. Annie Besant Rd.

Worli, MUMBAI 400 018, Tel. [phone], Fax. [phone]

Indonesia: see Singapore
Ireland: Newstead, Clonskeagh, DUBLIN 14,

Tel. [phone], Fax. [phone]
Israel: RAPAC Electronics, 7 Kehilat Saloniki St, PO Box 18053,

TEL AVIV 61180, Tel. [phone], Fax. [phone]
Italy: PHILIPS SEMICONDUCTORS, Piazza IV Novembre 3,

20124 MILANO, Tel. [phone], Fax. [phone]
Japan: Philips Bldg 13-37, Kohnan 2-chome, Minato-ku, TOKYO 108,

Tel. [phone], Fax. [phone]
Korea: Philips House, 260-199 Itaewon-dong, Yongsan-ku, SEOUL,

Tel. [phone], Fax. [phone]
Malaysia: No. 76 Jalan Universiti, 46200 PETALING JAYA, SELANGOR,

Tel. [phone], Fax. [phone]
Mexico: 5900 Gateway East, Suite 200, EL PASO, TEXAS 79905,

Tel. [phone]
Middle East: see Italy

Printed in The Netherlands 417087/1200/02/pp20 Date of release: 1997 Apr 16 Document order number: 9397 750 01529