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Part: PCA1486U/10/F2
Category:
Description: PCA148x Series; 32 KHZ Watch Circuits With Adaptive Motor Pulse
Company: Philips Semiconductors
Datasheet: Download PCA1486U/10/F2 datasheet File size : 3978 kB
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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
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor pulse
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 ORDERING INFORMATION TYPE NUMBER PCA1 485U/7 PCA1 486U/7 PCA1 486U/10 PCA1 487U/10 Note PACKAGE(1) NAME - - - - DESCRIPTION chip with bumps on tape chip with bumps on tape chip on foil chip on foil GENERAL DESCRIPTION
PCA148x series
· 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.
The PCA148x series devices are CMOS integrated circuits specially suited for battery-operated, quartz-crystal-controlled wrist-watches, with a bipolar stepping motor.
VERSION - - - -
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 1 2 3 4 5 6 7 8 DESCRIPTION ground (0 V) test output oscillator input oscillator output supply voltage motor 1 output motor 2 output reset input
OSC OUT 4
MSA968
VSS TEST OSC IN
1 2
8 7
RESET M2 M1 V DD
PCA148xT
3 6 5
Fig.1 Pin configuration, PCA148xT, (PMFP8).
1998 Apr 21
2
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor pulse
FUNCTIONAL DESCRIPTION AND TESTING The motor output delivers pulses of six different stages depending on the torque required to turn the motor (Fig.3). Every motor pulse is followed by a detection phase which monitors the waveform of the induced motor voltage. When a step is missed a correction sequence will be started (Fig.2). Motor pulses The circuit produces motor pulses of six different stages (stage 1 to 5, stage 6). Stages 1 to 5 are used in normal operation, stage 6 occurs under the following conditions: · Correction pulse after a missing step · End-of-life mode · If stage 5 is not enough to turn the motor. The ON state of the motor pulse varies between 43.75% and 75% of the duty factor tDF = 977 µs depending on the stage (Fig.3). It increases in steps of 6.25% per stage.
PCA148x series
After a RESET the circuit always starts and continues with stage 1, when all motor pulses have been executed. A failure to execute all motor pulses results in the circuit going into stage 2, this sequence will be repeated through to stage 6. When the motor pulses at stage 5 are not large enough to turn the motor, stage 6 is implemented for a maximum of 8 minutes with no attempt to keep current consumption low. After stage 6 has been executed the procedure is repeated from RESET. The circuit operates for 8 minutes at a fixed stage, if every motor pulse is executed. The next 480 motor pulses are then produced at the next lower stage unless a missing step is detected. If a step is missed a correction sequence is produced and for a maximum of 8 minutes the motor pulses are increased by one stage.
MOTOR PULSE
DETECTION
POSSIBLE CORRECTION SEQUENCE
VM1 - M2
tP
tD
tC tT
MSA969
Fig.2 Possible motor output waveform in normal operation with motor connected.
1998 Apr 21
3
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