PCA2000; PCA2001
32 kHz watch circuit with programmable adaptive motor pulse
Rev. 9 — 24 November 2011
Product data sheet
1. General description
The PCA2000 and PCA2001 are CMOS
1
integrated circuits 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 width
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.
The PCA2000 has a battery End Of Life (EOL) warning function. If the battery voltage
drops below the EOL threshold voltage (which can be programmed for silver oxide or
lithium batteries), the motor steps change from one pulse per second to a burst of four
pulses every 4 seconds.
The PCA2001 uses the same circuit as the PCA2000, but without the EOL function.
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 power consumption, typical 90 nA
One second output pulses for bipolar stepping motor
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
1.
The definition of the abbreviations and acronyms used in this data sheet can be found in
Section 15.
NXP Semiconductors
PCA2000; PCA2001
32 kHz watch circuit with programmable adaptive motor pulse
End Of Life (EOL) indication for silver oxide or lithium battery (only the PCA2000 has
the EOL feature)
Test mode for accelerated testing of the mechanical parts of the watch and the IC
Test bits for type recognition
3. Applications
Driver circuits for bipolar stepping motors
High immunity motor drive circuits
PCA2000_2001
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 9 — 24 November 2011
2 of 34
NXP Semiconductors
PCA2000; PCA2001
32 kHz watch circuit with programmable adaptive motor pulse
4. Ordering information
Table 1.
Ordering information
Package
Name
PCA2000U/AC/1
PCA2001U/AC/1
wire bond die
wire bond die
Description
8 bonding pads
8 bonding pads
8 bonding pads
8 bonding pads
wafer level chip-size package;
8 bumps
wafer level chip-size package;
8 bumps
wafer level chip-size package;
8 bumps
Delivery form
chip in tray
chip in tray
sawn wafer on Film Frame
Carrier (FFC)
sawn wafer on Film Frame
Carrier (FFC)
unsawn wafer with lead free
solder bumps
unsawn wafer with lead free
solder bumps
sawn wafer with lead free
solder bumps on Film Frame
Carrier (FFC)
Version
PCA200xU
PCA200xU
PCA200xU
PCA200xU
PCA200xCX
PCA200xCX
PCA200xCX
Type number
PCA2000U/10AC/1 wire bond die
PCA2001U/10AC/1 wire bond die
PCA2000CX8/5/1
PCA2001CX8/5/1
WLCSP8
WLCSP8
PCA2000CX8/12/1 WLCSP8
5. Marking
Table 2.
Marking codes
Marking code
PC
2000-1
PC
2001-1
PC
2000-1
PC
2001-1
PC
2000-1
PC
2001-1
PC
2000-1
Type number
PCA2000U/AC/1
PCA2001U/AC/1
PCA2000U/10AC/1
PCA2001U/10AC/1
PCA2000CX8/5/1
PCA2001CX8/5/1
PCA2000CX8/12/1
PCA2000_2001
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 9 — 24 November 2011
3 of 34
NXP Semiconductors
PCA2000; PCA2001
32 kHz watch circuit with programmable adaptive motor pulse
6. Block diagram
8 kHz
OSCIN
OSCOUT
3
4
OSCILLATOR
32 Hz
DIVIDER
RESET
8
RESET
÷4
TIMING ADJUSTMENT,
INHIBITION
5
1
VOLTAGE DETECTOR,
OTP-CONTROLLER
OTP-MEMORY
1 Hz
reset
V
DD
V
SS
EOL
PCA2000 only
i.c.
2
MOTOR CONTROL WITH
ADAPTIVE PULSE MODULATION
PCA2000
PCA2001
6
STEP
DETECTION
7
mgw567
MOT1
MOT2
Fig 1.
Block diagram of PCA2000 and PCA2001
PCA2000_2001
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 9 — 24 November 2011
4 of 34
NXP Semiconductors
PCA2000; PCA2001
32 kHz watch circuit with programmable adaptive motor pulse
7. Pinning information
7.1 Pinning
PCA200xU
V
SS
i.c.
1
2
x
0
OSCIN
OSCOUT
3
4
0
y
6
5
001aai177
PCA200xCX
8
7
RESET
MOT2
V
SS
i.c.
1
2
x
0
MOT1
V
DD
OSCIN
OSCOUT
3
4
0
y
6
5
001aai176
8
7
RESET
MOT2
MOT1
V
DD
a. Top view. For mechanical details, see
Figure 13.
Fig 2.
b. Top view. For mechanical details, see
Figure 14.
Pin configuration of PCA2000 and PCA2001
7.2 Pin description
Table 3.
Symbol
V
SS
i.c.
OSCIN
OSCOUT
V
DD
MOT1
MOT2
RESET
Pin description
Pin
1
2
3
4
5
6
7
8
Description
ground
internally connected
oscillator input
oscillator output
supply voltage
motor 1 output
motor 2 output
reset input
PCA2000_2001
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 9 — 24 November 2011
5 of 34
