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NXP Semiconductors Electronic Components Datasheet

PCA1487 Datasheet

CMOS

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INTEGRATED CIRCUITS
DATA SHEET
PCA148x series
32 kHz watch circuits with adaptive
motor pulse
Product specification
Supersedes data of 1998 Mar 26
File under Integrated Circuits, IC16
1998 Apr 21


NXP Semiconductors Electronic Components Datasheet

PCA1487 Datasheet

CMOS

No Preview Available !

Philips Semiconductors
32 kHz watch circuits with adaptive motor
pulse
Product specification
PCA148x series
FEATURES
32 kHz oscillator, amplitude regulated with excellent
frequency stability
High immunity of the oscillator to leakage currents
Time calibration electrically programmable and
reprogrammable (via EEPROM)
A quartz crystal is the only external component required
Very low current consumption; typically 170 nA
Output for bipolar stepping motors of different types
Up to 50% reduction in motor current compared with
conventional circuits, by self adaption of the motor pulse
width in accordance with the required torque of the
motor
No loss of motor steps possible because of on-chip
detection of the induced motor voltage
Indication for battery end-of-life
Stop function for accurate timing
Power-on reset for fast testing
Various test modes for testing the mechanical parts of
the watch and the IC.
GENERAL DESCRIPTION
The PCA148x series devices are CMOS integrated circuits
specially suited for battery-operated,
quartz-crystal-controlled wrist-watches, with a bipolar
stepping motor.
ORDERING INFORMATION
TYPE
NUMBER
PCA1 485U/7
PCA1 486U/7
PCA1 486U/10
PCA1 487U/10
NAME
PACKAGE(1)
DESCRIPTION
chip with bumps on tape
chip with bumps on tape
chip on foil
chip on foil
VERSION
Note
1. Figure 1 and Chapter “Package outline” show details of standard package, available for large orders only.
Chapter “Chip dimensions and bonding pad locations” shows exact pad locations for other delivery formats.
PINNING
SYMBOL
VSS
TEST
OSC IN
OSC OUT
VDD
M1
M2
RESET
PIN DESCRIPTION
1 ground (0 V)
2 test output
3 oscillator input
4 oscillator output
5 supply voltage
6 motor 1 output
7 motor 2 output
8 reset input
VSS 1
8 RESET
TEST 2
7 M2
PCA148xT
OSC IN 3
6 M1
OSC OUT 4
5 VDD
MSA968
Fig.1 Pin configuration, PCA148xT, (PMFP8).
1998 Apr 21
2


Part Number PCA1487
Description CMOS
Maker NXP
PDF Download

PCA1487 Datasheet PDF






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