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NXP Semiconductors Electronic Components Datasheet

PCA2003 Datasheet

CMOS

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PCA2003
32 kHz watch circuit with programmable adaptive motor pulse
and pulse period
Rev. 5 — 1 May 2019
Product data sheet
1. General description
The PCA2003 is a CMOS integrated circuit for battery operated wrist watches with a
32 kHz quartz crystal as timing element and a bipolar 1 Hz stepping motor. The quartz
crystal oscillator and the frequency divider are optimized for minimum power
consumption. A timing accuracy of 1 ppm is achieved with a programmable, digital
frequency adjustment.
To obtain the minimum overall power consumption for the watch, an automatic motor
pulse adaptation function is provided. The circuit supplies only the minimum drive current,
which is necessary to ensure a correct motor step. Changing the drive current of the
motor is achieved by chopping the motor pulse with a variable duty cycle. The pulse
period and the range of the variable duty cycle can be programmed to suit different types
of motors. The automatic pulse adaptation scheme is based on a safe dynamic detection
of successful motor steps.
A pad RESET is provided (used for stopping the motor) for accurate time setting and for
accelerated testing of the watch.
2. Features and benefits
Amplitude-regulated 32 kHz quartz crystal oscillator, with excellent frequency stability
and high immunity to leakage currents
Electrically programmable time calibration with 1 ppm resolution stored in One Time
Programmable (OTP) memory
The quartz crystal is the only external component connected
Very low supply current, typical 90 nA
One second output pulses for bipolar stepping motor
Five different programmable output periods (1 s to 30 s)
Minimum power consumption for the entire watch, due to self adaptation of the motor
drive according to the required torque
Reliable step detection circuit
Motor pulse width, pulse modulation, and pulse adaptation range programmable in a
wide range, stored in OTP memory
Stop function for accurate time setting and power saving during shelf life
Test mode for accelerated testing of the mechanical parts of the watch and the IC
Test bits for type recognition


NXP Semiconductors Electronic Components Datasheet

PCA2003 Datasheet

CMOS

No Preview Available !

NXP Semiconductors
PCA2003
32 kHz watch circuit with programmable adaptive motor pulse
3. Applications
Driver circuits for bipolar stepping motors
High immunity motor drive circuits
4. Ordering information
Table 1. Ordering information
Type number
Topside
marking
PCA2003U/10AC/1 PC 2003-1
Package
Name
wire bond die
Description
8 bonding pads - 1.16 x 0.86 x 0.2 mm
Version
PCA200xU
4.1 Ordering options
Table 2. Ordering options
Type number
Orderable part number Package
PCA2003U/10AC/1 PCA2003U/10AC/1,00
PCA2003U/10AC/1Z
wire bond
die
wire bond
die
Packing method
Minimum
order quantity
Sawn wafer on Film 15064
Frame Carrier (FFC)
Reel 7" Q2 Die in
tape reel DP
2000
Temperature
Tamb = 10 C to
+60 C
Tamb = 10 C to
+60 C
5. Block diagram
3
OSCIN
4
OSCOUT
VDD
5
VSS
1
OSCILLATOR
÷4
8 kHz
32 Hz
DIVIDER
RESET
8
RESET
TIMING ADJUSTMENT,
INHIBITION
reset
VOLTAGE DETECTOR,
OTP-CONTROLLER
OTP-MEMORY
1 Hz
MOTOR CONTROL WITH
ADAPTIVE PULSE MODULATION
i.c.
2
PCA2003
STEP
DETECTION
Fig 1. Block diagram of PCA2003
6
MOT1
7
MOT2
001aai168
PCA2003
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 1 May 2019
© NXP B.V. 2019. All rights reserved.
2 of 23


Part Number PCA2003
Description CMOS
Maker NXP
PDF Download

PCA2003 Datasheet PDF






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