PCA1485 Datasheet PDF - NXP Semiconductors
| Part Number | PCA1485 | |
| Description | 32 kHz watch circuits with adaptive motor pulse | |
| Manufacturers | NXP Semiconductors | |
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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
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Philips Semiconductors
32 kHz watch circuits with adaptive motor
pulse
Product specification
PCA148x series
Voltage level detector
The supply voltage is compared with the internal voltage
reference VEOL every minute. The first voltage level
detection is carried out 30 ms after RESET.
When the detected VDD voltage level is greater than VEOL,
the circuit operates in normal mode (Fig.3).
If the battery end-of-life is detected (VDD < VEOL), the
detection and stage control is switched OFF and the
waveform of stage 6 will be executed. To indicate this
condition the waveform is produced in bursts of 4 pulses
every 4 s.
Detection of motor movement
After a motor pulse, the motor is short-circuited to VDD for
1 ms. Afterwards the energy in the motor inductor will be
dissipated to measure only the current generated by the
induced motor voltage. During the time tDI (dissipation of
energy time) all switches shown in Fig.4 are open to
reduce the current as fast as possible. The current will now
flow through the diodes D3 and D2, or D4 and D1. Then
the first of 52 possible measurement cycles (tMC) starts to
measure the induced current.
P1 D1
D2 P2
VDD
L1
M1 MOTOR
M2
L2
N1 D3
D4 N2
V SS
MSA941
Fig.4 Motor driving and detecting circuit.
1998 Apr 21
5
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for PCA1485 electronic component. |
| Information | Total 20 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ PCA1485.PDF Datasheet ] | |
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