概述
数据手册PCA1462 概述
32 kHz watch circuits with adaptive motor pulse 具有自适应电机脉冲32 kHz钟表电路
PCA1462 数据手册
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PDF下载INTEGRATED CIRCUITS
DATA SHEET
PCA146x series
32 kHz watch circuits with adaptive
motor pulse
1998 Apr 21
Product specification
Supersedes data of 1998 Mar 18
File under Integrated Circuits, IC16
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA146x series
FEATURES
GENERAL DESCRIPTION
• 32 kHz oscillator, amplitude regulated with excellent
frequency stability
The PCA146x series devices are CMOS integrated circuits
specially suited for battery-operated,
quartz-crystal-controlled wrist-watches, with a bipolar
stepping motor.
• 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
PACKAGE(1)
NUMBER
NAME
DESCRIPTION
VERSION
PCA1461U
−
−
−
−
−
−
−
−
−
−
chip in tray
−
−
−
−
−
−
−
−
−
−
PCA1461U/10
PCA1462U
chip on foil
chip in tray
PCA1462U/7
PCA1462U/10
PCA1463U
chip with bumps on tape
chip on foil
chip in tray
PCA1463U/10
PCA1465U/10
PCA1465U/7
PCA1467U/10
chip on foil
chip on foil
chip with bumps on tape
chip on foil
Note
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
PCA146x series
PINNING
SYMBOL
VSS
PIN
DESCRIPTION
ground (0 V)
1
2
3
4
5
6
7
8
V
1
2
3
4
8
7
6
5
RESET
M2
SS
TEST
OSC IN
OSC OUT
VDD
test output
TEST
OSC IN
oscillator input
oscillator output
supply voltage
motor 1 output
motor 2 output
reset input
PCA146xT
M1
V
OSC OUT
DD
MSA937
M1
M2
Fig.1 Pin configuration, PCA146xT, (PMFP8).
RESET
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.
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).
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.
Motor pulses
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 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”).
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.
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.
1998 Apr 21
3
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA146x series
DETECTION
POSSIBLE CORRECTION
SEQUENCE
MOTOR
PULSE
V
M1 - M2
MSA942
t
t
t
P
D
C
t
T
Fig.2 Possible motor output waveform in normal operation with motor connected.
1998 Apr 21
4
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=
t
t
t
SON DF
ON
t
= 488 µs
t
t
= 977µs
t
t
ONL
SONF
SON
DF
SOFF
t
t
DF SOFF
t
=
DF
STAGE 1
56.25 %
62.50 %
68.75 %
75.00 %
81.25 %
STAGE 2
STAGE 3
STAGE 4
STAGE 5
STAGE 8
100.00 %
t
= 3.9 ms
P3
t
= 5.86 ms
P2
MSA947
t
= 7.81 ms
P1
tOFF for stage 1 to 5 = 488 µs − stage × 61 µs
tON for stage 1 to 5 = 488 µs + stage × 61 µs
Fig.3 Motor pulses in the silver-oxide mode (VDD = 1.55 V).
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t
=
ON
µs
t
= 244 µs
t
= 183 µs
t
t
= 977
t
t
ONL
DF
LONF
AOFF
LOFF
AOFF
t
t
t
LOFF LOFF
DF
t
DF
STAGE 1
37.50 %
43.75 %
50.00 %
56.25 %
62.50 %
STAGE 2
STAGE 3
STAGE 4
STAGE 5
STAGE 8
81.25 %
t
= 3.9 ms
P3
t
= 5.86 ms
P2
MSA946
t
= 7.81 ms
P1
tOFF for stage 1 to 5 = 672 µs − stage × 61 µs
tON for stage 1 to 5 = 305 µs + stage × 61 µs
Fig.4 Motor pulses in the lithium mode (VDD = 2.1 V).
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA146x series
Voltage level detector
Detection of motor movement
The supply voltage is compared with the internal voltage
reference VLIT and VEOL every minute. The first voltage
level detection is carried out 30 ms after RESET.
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.5 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.
When a lithium voltage level is detected (VDD ≥ VLIT), the
circuit starts operating in the lithium mode (Fig.4).
When the detected VDD voltage level is between VLIT and
VEOL, the circuit operates in the silver-oxide mode (Fig.3).
If the battery end-of-life is detected (VDD < VEOL), the
detection and stage control is switched OFF and the
waveform produced is an unchopped version of the
stage 8 waveform. To indicate this condition the waveform
is produced in bursts of 4 pulses every 4 s.
V
DD
P1
D1
D2
P2
L1
M1
MOTOR
M2
L2
N1
D3
D4
N2
V
SS
MSA941
Fig.5 Motor driving and detecting circuit.
1998 Apr 21
7
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA146x series
The waveform of the induced current must enable all these
measurements within the time tD after the end of a positive
motor pulse in order to be accepted as a waveform of an
executed motor pulse.
Detection criteria
The PCA146x uses current detection in two defined parts
of the detection phase to determine if the motor has moved
(refer to Figs 6 and 7). The detection criteria are:
If the detection criterion is satisfied earlier, a measurement
cycle will not be started and the switches P1 and P2 stay
part 1
• Minimum value of P = 1; where P = number of
closed, the motor is switched to VDD
.
measured positive current polarities after tDI.
Every measurement cycle (tMC) has 4 phases. These are
detailed in Table 1.
part 2
• Minimum value of N = 2; where N = number of
measured positive current polarities since the first
negative current polarity after part 1 was detected
(see Fig.6).
Note that detection and pulse width control will be switched
OFF when the battery voltage is below the end-of-life
voltage (VEOL), or if stage 5 is not sufficient to turn the
motor.
If the opposite polarity is measured in one part, the internal
counter is reset, so the results of all measurements in this
part are ignored.
Table 1 Measurement cycle
SYMBOL PHASE
DESCRIPTION
tM1
1
During tM1 the switches P1 and P2 are closed in order to switch the motor to VDD, so the
induced current flows unaffected through the motor inductance.
tM2
2
Measures the induced current; during a maximum time tM2 all switches are open until a change
is sensed by one of the level detectors (L1, L2). The motor is short-circuited to VDD
.
Depending on the direction of the interrupted current:
• The current flows through diodes D3 and D2, causing the voltage at M1 to decrease in relation
to M2;
• The current flows through diodes D4 and D1, causing the voltage at M2 to decrease in relation
to M1.
A successfully detected current polarity is normally characterized by a short pulse of
0.5 to 10 µs with a voltage up to ±2.1 V, failed polarity detection by the maximum pulse width of
61 µs and a voltage of ±0.5 V (see Fig.7).
tM3
tM4
3
4
The switches P1 and P2 remain closed for the time tM3.
If the circuit detects fewer pulses than P and N respectively, a pulse of the time tM4 occurs to
reduce the induced current. Therefore P2 and P1 are opened and N1 and N2 are closed.
Otherwise P1 and P2 remain closed.
1998 Apr 21
8
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA146x series
MOTOR PULSE
DETECTION PHASE
I
M1 - M2
detection criterion
is satisfied
part 1
part 2
t
MSA944
t
t
DS
DI
t
t
D
P
Fig.6 Typical current waveform of a successfully executed motor pulse.
DETECTION PHASE
MOTOR
PULSE
V
M1 - M2
t
= 244 µs
M1
t
= 488 µs
MC
t
t
t
M3
M4 M1
t
t
DI
DS
t
= 61
t
= 61
µs
µs
M2
M2
t
t
D
P
current polarity
not measured
detection
criterion is
satisfied
V
M1
t
= 61 µs
t
= 488 µs
MC
M2
= 244 µs
t
M1
t
t
t = 244 µs
M1
DS
DI
MSA945
t
= 61 µs
M2
Fig.7 Detection phase of the current waveform in Fig.6.
9
1998 Apr 21
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA146x series
Correction sequence (see Fig.8)
If a missing step is detected, a correction sequence is produced. This consists of a small pulse (tC1) which gives the motor
a defined position and after 29.30 ms a pulse of stage 8 (tC2) to turn the motor.
MOTOR
PULSE
DETECTION
CORRECTION SEQUENCE
V
M1 - M2
t
= t
P
t
= 977 µs
C2
C1
MSA943
t
t
t
= 30.27 ms
t
P
P
D
C
Fig.8 Correction sequence after a missing motor step with motor connected.
1998 Apr 21
10
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA146x series
3. VDD is decreased to 2.5 V during a motor pulse to
initialize a storing sequence.
Time calibration
Taking a normal quartz crystal with frequency 32768kHz,
frequency deviation (∆f/f) of ±15 × 10−6 and CL = 8.2 pF;
the oscillator frequency is offset (by using non-symmetrical
internal oscillator input and output capacitances of 10 pF
and 15 pF) such that the frequency deviation is
4. The first VDD pulse to 5.1 V erases the contents of
EEPROM.
5. When the EEPROM is erased a logic 1 is at the TEST
pin.
positive-only. This positive deviation can then be
compensated for to maintain time-keeping accuracy.
6. VDD is increased to 5.1 V to read the data by pulsing
VDD n times to 4.5 V. After the n edge, VDD is
decreased to 2.5 V.
Once the positive frequency deviation is measured, a
corresponding number ‘n’ (see Table 2) can be
programmed into the device’s EEPROM. This causes n
pulses of frequency 8192 Hz to be inhibited every minute
of operation, which achieves the required calibration.
7. VDD is increased to 5.1 V to store n bits in the
EEPROM.
8. VDD is decreased to 2.5 V to terminate the storing
sequence and to return to operating mode.
The programming circuit is shown in Fig.9. The required
number n is programmed into EEPROM by varying VDD
according to the steps shown in Fig.10, which are
explained below:
9. VDD is increased to 5.1 V to check writing from the
motor pulse period tT3.
10. VDD is decreased to the operation voltage between
two motor pulses to return to operating mode.
(Decreasing VDD during the motor pulse would restart
the programming mode).
1. The positive quartz frequency deviation (∆f/f) is
measured, and the corresponding values of n are
found according to Table 2.
The time calibration can be reprogrammed up to 100
times.
2. VDD is increased to 5.1 V allowing the contents of the
EEPROM to be checked from the motor pulse period
tT3 at nominal frequency.
Table 2 Quartz crystal frequency deviation, n and tT3
FREQUENCY
NUMBER OF
DEVIATION
∆f/f
tT3
(ms)
SIGNAL GENERATOR
PULSES
(n)
(× 10−6)
0(1)
0
1
2
.
31.250(2)
V
SS
RESET
M2
1
2
3
8
7
6
+2.03
31.372
+4.06
31.494
TEST
.
.
PCA146x
SERIES
M
.
.
.
OSC IN
OSC OUT
M1
V
.
.
.
32 kHz
+127.89
63
38.936
DD
4
5
Notes
MSA940
1. Increments of 2.03 × 10−6/step.
2. Increments of 122 µs/step.
Fig.9 Circuit for programming the time calibration.
1998 Apr 21
11
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CHECKING
CONTENT CHECKING
ERASURE
DATA INPUT
STORING
I
DD
t
T3
∆V
DDP
1
2
3
n
5.1
4.5
9
2
10
t
= 1 µs
edge
V
(V)
DD
0.1 ms
min.
2.5
1
3
4
5
6
7
8
9
10
1.5
t
= 5 ms
t
= 5 ms
S
E
0 (V
)
SS
(1)
(1)
(1) (1)
MSA948
(1) Rise and fall time should be greater than 400 µs/V for immediately correct checking.
Fig.10 VDD for programming.
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA146x series
Test 1, VDD > VEOL. Normal function takes place except
that the motor pulse period is tT1 = 125 ms instead of tT,
and the motor pulse stage is reduced every second
instead of every 8 minutes. At TEST a speeded-up
8 minute signal is available.
Power-on reset
For correct operation of the Power-on reset the rise time of
VDD from 0 V to 2.1 V should be less than 0.1 ms.
All resetable flip-flops are reset. Additionally the polarity of
the first motor pulse is positive: VM1 − VM2 ≥ 0 V.
Test 2, VDD < VEOL. Motor pulses of stage 8 are produced,
with a time period of tT2 = 31.25 ms.
Customer testing
Test and reset modes are terminated by disconnecting the
RESET pin.
An output frequency of 32 Hz is provided at RESET (pin 8)
to be used for exact frequency measurement. Every
minute a jitter occurs as a result of the inhibition, which
occurs 90 to 150 ms after disconnecting the RESET from
Test 3, VDD > 5.1 V. Motor pulses of stage 8 are
produced, with a time period of tT3 = 31.25 ms and
n × 122 µs to check the contents of the EEPROM. At
TEST a speeded-up cycle for motor pulse period signal tT
is available at 1024 times its normal frequency.
Decreasing VDD voltage level to lower than 2.5 V between
two motor pulses returns the circuit to normal operating
conditions.
VDD
.
Connecting the RESET to VDD stops the motor pulses
leaving them in a 3-state mode and sets the motor pulse
width for the next available motor pulse to stage 1 in the
silver-oxide mode. A 32 Hz signal without jitter is produced
at the TEST pin.
Debounce time RESET = 14.7 to 123.2 ms.
Connecting RESET to VSS activates Tests 1 and 2 and
disables the inhibition.
AVAILABLE TYPES
Refer to Chapters “Ordering information” and “Functional description and testing”.
SPECIFICATIONS
SHORT
TYPE
NUMBER
PERIOD
PULSE
WIDTH
tP
DELIVERY
FORMAT(1)
BATTERY
EOL
DETECTION
tT
(s)
DRIVE
(%)
DETECTION
CRITERION
EEPROM
REMARKS
(ms)
1461
1462
1463
1465
1467
U; U/10
1
1
1
1
1
7.8
5.8
3.9
5.8
7.8
max. 100
81
P = 1
N = 2
yes
yes
yes
yes
yes
yes
yes
yes
no
1.5 V and
2.1 V Lithium
U; U/7;
U/10
max. 100
81
P = 1
N = 2
1.5 V and
2.1 V Lithium
U; U/10
U/10; U/7
U/10
max. 100
81
P = 1
N = 2
1.5 V and
2.1 V Lithium
max. 100
P = 1
N = 2
1.5 V
1.5 V
max. 100
P = 1
N = 2
no
Note
1. U = Chip in tray; U/7 = chip with bumps on tape; U/10 = chip on foil.
1998 Apr 21
13
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA146x series
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
VDD
PARAMETER
supply voltage
CONDITIONS
VSS = 0 V; note 1
MIN.
−1.8
MAX.
+6
UNIT
V
V
VI
all input voltages
VSS
VDD
output short-circuit duration
operating ambient temperature
storage temperature
indefinite
+60
Tamb
Tstg
−10
−30
°C
°C
+100
Note
1. Connecting the battery with reversed polarity does not destroy the circuit, but in this condition a large current flows,
which will rapidly discharge the battery.
HANDLING
Inputs and outputs are protected against electrostatic discharges in normal handling. However, to be totally safe, it is
advisable to take handling precautions appropriate to handling MOS devices. Advice can be found in
“Data Handbook IC16, General, Handling MOS Devices”.
CHARACTERISTICS
VDD = 1.55 V; VSS = 0 V; fosc = 32.768 kHz; Tamb = 25 °C; crystal: RS = 20 kΩ; C1 = 2 to 3 fF; CL = 8 to 10 pF;
C0 = 1 to 3 pF; unless otherwise specified.
Immunity against parasitic impedance = 20 MΩ between adjacent pins.
SYMBOL
Supply
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
VDD1
supply voltage
Tamb = −10 to +60 °C
transient within 1.2 V and 2.5 V
programming
1.2
1.55
2.5
V
∆VDD
VDD2
supply voltage variation
supply voltage
−
−
0.25
5.2
V
V
V
5.0
0.55
5.1
0.6
∆VDDP
supply voltage pulse
variation
programming
0.65
IDD1
IDD2
IDD3
supply current
supply current
supply current
between motor pulses
VDD = 2.1 V
−
−
−
170
190
180
260
300
280
nA
nA
nA
stop mode; pin 8 connected to
VDD
IDD4
IDD5
supply current
supply current
VDD = 2.1 V
−
−
220
360
600
nA
nA
Tamb = −10 to +60 °C
−
Motor output
Vsat
saturation voltage Σ (P + N) RM = 2 kΩ; Tamb = −10 to +60 °C −
150
200
200
300
mV
Zo(sc)
output short-circuit
impedance
between motor pulses
Itransistor < 1 mA
−
Ω
1998 Apr 21
14
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA146x series
SYMBOL
Oscillator
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
VOSC ST
gm
starting voltage
1.2
−
−
−
−
V
transconductance
start-up time
V
i(p-p) ≤ 50 mV
6
15
1
µS
tosc
−
s
∆f/f
frequency stability
input capacitance
output capacitance
∆VDD = 100 mV
−
0.05 × 10−6 0.3 × 10−6
Ci
8
10
15
12
18
pF
pF
Co
12
Voltage level detector
VLIT
threshold voltage
1.62
1.30
−
1.80
1.38
10
1.98
1.46
−
V
VEOL
∆VEOL
TCEOL
threshold voltage
V
hysteresis of threshold
temperature coefficient
mV
mV/K
−
−1
−
Reset input
fo
output frequency
output voltage swing
edge time
−
32
−
−
−
−
−
−
Hz
V
∆Vo
tedge
Iim
R = 1 MΩ; C = 10 pF
R = 1 MΩ; C = 10 pF
note 1
1.4
−
1
µs
nA
nA
peak input current
average input current
−
320
10
Ii(av)
−
Note
1. Duty factor is 1 : 32 and RESET = VDD or VSS
.
1998 Apr 21
15
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA146x series
TIMING PARAMETERS
SYMBOL
tT
PARAMETER
SECTION
VALUE
OPTION
UNIT
cycle for motor pulse (note 1)
motor pulse width
duty factor
motor pulse (Figs 2, 3 and 4) 1
5, 10, 12 or 20 s
tP
7.81
3.9 or 5.9
ms
tDF
tONL
tv
977
−
µs
µs
s
last duty factor on
voltage detection cycle
duty factor on
61 to 305
−
level mode
60
−
tSON
tSOFF
tSONF
tAOFF
tLON
tLOFF
tLONF
tE
silver-oxide mode (Fig.3)
550 to 794
−
µs
µs
µs
µs
µs
µs
µs
s
duty factor off
427 to 183
−
first duty factor on
additional duty factor off
duty factor on
488
−
lithium mode (Fig.4)
183
−
305 to 611
−
duty factor off
672 to 366
−
first duty factor on
EOL sequence
244
−
end-of-life mode
detection (Fig.7)
4
−
tE1
motor pulse width
time between pulses
detection sequence
short-circuited motor
dissipation of energy
measurement cycle
phase 1
tP
−
ms
ms
ms
µs
µs
µs
µs
µs
µs
µs
tE2
31.25
−
tD
4.3 to 28.3
−
tDS
tDI
977
977
488
244
61
−
−
tMC
tM1
tM2
tM3
tM4
P
−
−
phase 2 (measure window)
phase 3
−
122
61
−
phase 4
−
positive current polarities
negative current polarities
correction sequence
small pulse width
large pulse width
cycles for motor-pulses in:
test 1
1
P < N
N
2
2 to 6
tC
correction sequence (Fig.8)
tP + 30.27
977
tP
−
−
−
ms
µs
tC1
tC2
ms
testing
Fig.10
tT1
125
−
−
−
−
ms
ms
ms
ms
tT2
test 2
31.25
tT3
test 3
31.25 to 39
14.7 to 123.2
tDEB
debounce time for
RESET = VDD
Note
1. No option available when EOL indication is required.
1998 Apr 21
16
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA146x series
CHIP DIMENSIONS AND BONDING PAD LOCATIONS
y
V
SS
OSC OUT
OSC IN
TEST
PCA146xU
SERIES
1.44 mm
0
0
x
V
M1
M2
RESET
DD
2.02 mm
MSA938
Chip area: 2.91 mm2.
Bonding pad dimensions: 110 µm × 110 µm.
Chip thickness: 200 ±25 µm, with bumps: 270 ±25 µm.
Fig.11 Bonding pad locations, PCA146xU series; 8 terminals.
Table 3 Bonding pad locations (dimensions in µm)
All x/y coordinates are referenced to bottom left pad (VDD), see Fig.11.
PAD
x
y
VSS
1290
940
1100
1100
1100
1100
0
TEST
OSC IN
OSC OUT
VDD
481
−102
0
M1
578
0
M2
930
0
RESET
1290
−497.5
0
chip corner (max. value)
−170
1998 Apr 21
17
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA146x series
APPLICATION INFORMATION
1.55 V
V
SS
RESET
M2
1
2
3
8
7
6
(2)
(2)
C
C
M
TEST
OSC IN
PCA146x
SERIES
(1)
M
M
M1
V
DD
OSC OUT
4
5
MSA939
(1) Quartz crystal case should be connected to VDD. Stray capacitance and leakage resistance from RESET, M1 or M2 to OSC IN should be less than
0.5 pF or larger than 20 MΩ.
(2) Motor, probe and stray capacitance from M2 or M1 to VDD or VSS should be less than CM = 80 pF for correct operation of the detection circuit.
Driving the motor at its minimum energy, probe and stray capacitance must be avoided.
Fig.12 Typical application circuit diagram.
1998 Apr 21
18
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA146x series
PACKAGE OUTLINE
PMFP8: plastic micro flat package; 8 leads (straight)
SOT144-1
D
E
X
c
m
t
n
H
E
8
5
Q
2
A
2
Q
pin 1 index
1
L
detail X
1
4
e
w M
b
0
2.5
5 mm
scale
DIMENSIONS (mm are the original dimensions)
(1)
m
max.
n
max.
(1)
A
H
E
Q
Q
2
UNIT
b
c
e
L
t
w
2
D
E
1
0.90
0.70
0.40
0.25
0.19
0.12
3.1
2.9
3.1
2.9
4.6
4.4
0.40
0.30
0.40
0.30
mm
0.80
0.75
0.26
0.3
0.95
0.1
Note
1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.
REFERENCES
OUTLINE
EUROPEAN
PROJECTION
ISSUE DATE
VERSION
IEC
JEDEC
EIAJ
94-01-25
95-01-24
SOT144-1
1998 Apr 21
19
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA146x series
SOLDERING
Introduction
Wave soldering
Wave soldering techniques can be used for all SO
packages if the following conditions are observed:
There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.
• A double-wave (a turbulent wave with high upward
pressure followed by a smooth laminar wave) soldering
technique should be used.
• The longitudinal axis of the package footprint must be
parallel to the solder flow.
• The package footprint must incorporate solder thieves at
the downstream end.
This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
our “IC Package Databook” (order code 9398 652 90011).
During placement and before soldering, the package must
be fixed with a droplet of adhesive. The adhesive can be
applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the
adhesive is cured.
Reflow soldering
Reflow soldering techniques are suitable for all SO
packages.
Maximum permissible solder temperature is 260 °C, and
maximum duration of package immersion in solder is
10 seconds, if cooled to less than 150 °C within
Reflow soldering requires solder paste (a suspension of
fine solder particles, flux and binding agent) to be applied
to the printed-circuit board by screen printing, stencilling or
pressure-syringe dispensing before package placement.
6 seconds. Typical dwell time is 4 seconds at 250 °C.
A mildly-activated flux will eliminate the need for removal
of corrosive residues in most applications.
Several techniques exist for reflowing; for example,
thermal conduction by heated belt. Dwell times vary
between 50 and 300 seconds depending on heating
method. Typical reflow temperatures range from
215 to 250 °C.
Repairing soldered joints
Fix the component by first soldering two diagonally-
opposite end leads. Use only a low voltage soldering iron
(less than 24 V) applied to the flat part of the lead. Contact
time must be limited to 10 seconds at up to 300 °C. When
using a dedicated tool, all other leads can be soldered in
one operation within 2 to 5 seconds between
270 and 320 °C.
Preheating is necessary to dry the paste and evaporate
the binding agent. Preheating duration: 45 minutes at
45 °C.
1998 Apr 21
20
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA146x series
DEFINITIONS
Data sheet status
Objective specification
Preliminary specification
Product specification
This data sheet contains target or goal specifications for product development.
This data sheet contains preliminary data; supplementary data may be published later.
This data sheet contains final product specifications.
Limiting values
Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.
Application information
Where application information is given, it is advisory and does not form part of the specification.
LIFE SUPPORT APPLICATIONS
These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.
1998 Apr 21
21
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA146x series
NOTES
1998 Apr 21
22
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA146x series
NOTES
1998 Apr 21
23
Philips Semiconductors – a worldwide company
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Slovakia: see Austria
Slovenia: see Italy
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TAIPEI, Taiwan Tel. +886 2 2134 2865, Fax. +886 2 2134 2874
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252042 KIEV, Tel. +380 44 264 2776, Fax. +380 44 268 0461
Italy: PHILIPS SEMICONDUCTORS, Piazza IV Novembre 3,
20124 MILANO, Tel. +39 2 6752 2531, Fax. +39 2 6752 2557
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MIDDLESEX UB3 5BX, Tel. +44 181 730 5000, Fax. +44 181 754 8421
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Tel. +9-5 800 234 7381
Middle East: see Italy
For all other countries apply to: Philips Semiconductors,
Internet: http://www.semiconductors.philips.com
International Marketing & Sales Communications, Building BE-p, P.O. Box 218,
5600 MD EINDHOVEN, The Netherlands, Fax. +31 40 27 24825
© Philips Electronics N.V. 1998
SCA57
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.
The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed
without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license
under patent- or other industrial or intellectual property rights.
Printed in The Netherlands
415108/1200/04/pp24
Date of release: 1998 Apr 21
Document order number: 9397 750 03769
PCA1462 相关器件
| 型号 | 制造商 | 描述 | 价格 | 文档 |
| PCA1462T | NXP | IC STEPPING MOTOR WATCH, PDFP8, Clock IC | 获取价格 |
|
| PCA1462U | NXP | 32 kHz watch circuits with adaptive motor pulse | 获取价格 |
|
| PCA1462U/10 | NXP | 32 kHz watch circuits with adaptive motor pulse | 获取价格 |
|
| PCA1462U/10 | PHILIPS | Clock IC, CMOS, | 获取价格 |
|
| PCA1462U/7 | NXP | 32 kHz watch circuits with adaptive motor pulse | 获取价格 |
|
| PCA1462U/7 | PHILIPS | Clock IC, CMOS, | 获取价格 |
|
| PCA1463 | NXP | 32 kHz watch circuits with adaptive motor pulse | 获取价格 |
|
| PCA1463U | NXP | 32 kHz watch circuits with adaptive motor pulse | 获取价格 |
|
| PCA1463U/10 | NXP | 32 kHz watch circuits with adaptive motor pulse | 获取价格 |
|
| PCA1463U/10 | PHILIPS | Clock IC, CMOS, | 获取价格 |
|
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