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Details, datasheet, quote on part number:PCA1465U/F2
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Datasheet text preview:
INTEGRATED CIRCUITS
DATA SHEET
PCA146x series 32 kHz watch circuits with adaptive motor pulse
Product specification Supersedes data of 1998 Mar 18 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 to match the required torque of the motor · No loss of motor steps possible because of on-chip detection of the induced motor voltage · Detector for lithium or silver-oxide battery voltage levels · 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. ORDERING INFORMATION TYPE NUMBER PCA1 461U PCA1 461U/10 PCA1 462U PCA1 462U/7 PCA1 462U/10 PCA1 463U PCA1 463U/10 PCA1 465U/10 PCA1 465U/7 PCA1 467U/10 Note PACKAGE(1) NAME - - - - - - - - - - chip in tray chip on foil chip in tray chip with bumps on tape chip on foil chip in tray chip on foil chip on foil chip with bumps on tape chip on foil DESCRIPTION GENERAL DESCRIPTION
PCA146x series
The PCA146x 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.
1998 Apr 21
2
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor pulse
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
VSS TEST OSC IN OSC OUT 1 2
PCA146x series
8 7
RESET M2 M1 V DD
PCA146xT
3 4
MSA937
6 5
Fig.1 Pin configuration, PCA146xT, (PMFP8).
FUNCTIONAL DESCRIPTION AND TESTING The motor output delivers pulses of six different stages depending on the torque required to turn the motor (Figs. 3 and 4). 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 8). Each stage has two independent modes: silver-oxide and lithium. The voltage level of VDD determines which mode is selected (see Section "Voltage level detector"). Stages 1 to 5 (both modes) are used in normal operation, stage 8 occurs under the following conditions: · Correction pulse after a missing step (both modes) · End-of-life mode · If stage 5 is not enough to turn the motor (both modes). In the silver-oxide mode, the ON state of the motor pulse varies between 56.25% and 100% of the duty factor tDF = 977 µs depending on the stage (Fig.3). It increases in steps of 6.25% per stage.
In the lithium mode, the ON state of the motor pulse is reduced by 18.75% of the duty factor tDF (Fig.4) to compensate for the increase in the voltage level. 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 8. When the motor pulses at stage 5 are not large enough to turn the motor, stage 8 is implemented for a maximum of 8 minutes with no attempt to keep current consumption low. After stage 8 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.
1998 Apr 21
3
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