INTEGRATED CIRCUITS DATA SHEET PCF1175C 4-digit duplex LCD car clock Product specification Supersedes data of September 1993 File under Integrated Circuits, IC16 1997 Apr 16
Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1175C FEATURES GENERAL DESCRIPTION • Internal voltage regulator is electrically programmable for various LCD voltages 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).
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 VSS 5 negative supply voltage MODE 6 12/24-hour mode select input VPP 7 programming voltage input TS 8 test speed-up mode input ENABLE 9 enable input (for S1 and S2) VDD 10 positive supply voltage FLASH 11 colon option input SEL 12 EEPROM select inpu
Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1175C FUNCTIONAL DESCRIPTION AND TESTING The average voltages across the segments are: Outputs 1. VON(RMS) = 0.79 VDD 2. VOFF(RMS) = 0.35 VDD. 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.
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. MSA995 −8 V SS (V) −6 (3) (2) −4 (1) −2 0 40 0 40 80 T ( o C) 120 (1) Programmed to 4.
Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1175C 12/24-hour mode Segment test/reset 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. When S1 and S2 are connected to VSS, all LCD segments are switched ON. Releasing switches S1 and S2 resets the display.
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 VPP 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).
Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1175C 50 µs V PP 50 µs VDD VDD 5V 50 µs clears cells incrementing counters store pulse VDD DATA VDD 5V tE tH tL tH tL n tH tW t E , t W = 4 to 6 ms t H = 1 µs t L = 1 to 1.5 µs 0V pulse generators V PP SEL VSS V DD DATA PCF1175C V SS OSC OUT OSC IN C ext 47 µF R MSB223 12 V 6.8 kΩ Fig.6 Programming diagram.
Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1175C LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT VDD supply voltage with respect to VSS − 8 V IDD supply current VSS = 0 V; note 1 − 3 mA VI input voltage all pins except VPP and DATA −0.3 VDD + 0.3 V pins VPP and DATA −3 VDD + 0.
Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1175C CHARACTERISTICS VDD = 3 to 6 V; VSS = 0 V; Tamb = −40 to +85 °C; crystal: f = 4.194304 MHz; Rs = 50 Ω; CL = 12 pF; maximum frequency tolerance = ±30 × 10−6; unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT Supply VDD supply voltage voltage regulator programmed to 4.
Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1175C F3/E3 A4/COL B2/C2 F2/E2 y G2/D2 B1/C1 CHIP DIMENSIONS AND BONDING PAD LOCATIONS G3/AD3 A2/ADEG1 AM/PM B3/C3 BP2 F4/E4 BP1 G4/D4 PCF1175CU 2.92 mm S1 B4/C4 S2 DATA OSC IN SEL OSC OUT FLASH 0 0 1.92 mm VDD ENABLE TS VPP MODE VSS x MSB224 Chip area: 5.61 mm2. Bonding pad dimensions: 110 µm × 110 µm. Chip thickness: 381 ±25 µm. Fig.7 Bonding pad locations, PCF1175CU; 28 terminals.
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 (VSS), see Fig.7.
Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1175C APPLICATION INFORMATION BP1 28 26 segment drivers to LCD DECODER BP2 27 14 PCF1175C DECODER AM/PM COUNTER OSC IN 3 OSC OUT 4 SEL DATA S1 HOURS COUNTER MINUTES COUNTER SECONDS COUNTER ADJUSTABLE DIVIDER OSCILLATOR 6.
Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1175C PACKAGE OUTLINE SO28: plastic small outline package; 28 leads; body width 7.5 mm SOT136-1 D E A X c y HE v M A Z 15 28 Q A2 A (A 3) A1 pin 1 index θ Lp L 1 14 e bp 0 detail X w M 5 10 mm scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT A max. A1 A2 A3 bp c D (1) E (1) e HE L Lp Q v w y mm 2.65 0.30 0.10 2.45 2.25 0.25 0.49 0.36 0.32 0.23 18.
Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1175C SOLDERING Wave soldering Introduction Wave soldering techniques can be used for all SO packages if the following conditions are observed: 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.
Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1175C DEFINITIONS 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.
Philips Semiconductors Product specification 4-digit duplex LCD car clock PCF1175C NOTES 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
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