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PCA1626U 데이터시트 PDF




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부품번호 PCA1626U 기능
기능 32 kHz watch circuits with EEPROM
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PCA1626U 데이터시트, 핀배열, 회로
INTEGRATED CIRCUITS
DATA SHEET
PCA16xx series
32 kHz watch circuits with
EEPROM
Product specification
Supersedes data of 1997 Apr 21
File under Integrated Circuits, IC16
1997 Dec 12




PCA1626U pdf, 반도체, 판매, 대치품
Philips Semiconductors
32 kHz watch circuits with EEPROM
Product specification
PCA16xx series
Time calibration
Taking a normal quartz crystal with frequency 32768kHz,
frequency deviation (f/f) of ±15 × 106 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
positive-only. This positive deviation can then be
compensated for to maintain time-keeping accuracy.
Once the positive frequency deviation is measured, a
corresponding number ‘n’ (see Table 1) is 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.
The programming circuit is shown in Fig.2. The required
number n is programmed into EEPROM by varying VDD
according to the steps shown in Fig.3, which are
explained below:
1. The positive quartz frequency deviation (f/f) is
measured, and the corresponding values of n are
found according to Table 1.
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.
3. VDD is decreased to 2.5 V during a motor pulse to
initialize a storing sequence.
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.
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.
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.
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).
The time calibration can be reprogrammed up to 100
times.
Table 1 Quartz crystal frequency deviation, n and tT3
FREQUENCY
DEVIATION
f/f
(× 106)
0(1)
+2.03
+4.06
.
.
.
+127.89
NUMBER OF
PULSES
(n)
0
1
2
.
.
.
63
tT3
(ms)
31.250(2)
31.372
31.494
.
.
.
38.936
Notes
1. Increments of 2.03 × 106/step.
2. Increments of 122 µs/step.
SIGNAL GENERATOR
32 kHz
V SS
1
RESET
8
TEST
2
M2
7
PCA16xx
SERIES
OSC IN
M1
36
M
OSC OUT
4
VDD
5
MSA975
Fig.2 Circuit for programming the time calibration.
1997 Dec 12
4

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PCA1626U 전자부품, 판매, 대치품
Philips Semiconductors
32 kHz watch circuits with EEPROM
Product specification
PCA16xx series
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC134).
SYMBOL
VDD
VI
Tamb
Tstg
PARAMETER
supply voltage
all input voltages
output short-circuit duration
operating ambient temperature
storage temperature
CONDITIONS
VSS = 0 V; note 1
MIN.
1.8
VSS
10
30
MAX.
UNIT
+6 V
VDD
V
indefinite
+60
+100
°C
°C
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 k; C1 = 2 to 3 fF; CL = 8 to 10 pF;
C0 = 1 to 3 pF; unless otherwise specified.
Immunity against parasitic impedance = 20 Mfrom one pin to an adjacent pin.
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
Supply
VDD
VDD
VDDP
VDDP
IDD1
IDD2
IDD3
IDD4
IDD5
supply voltage
supply voltage variation
supply voltage pulse
supply voltage pulse variation
supply current
supply current
supply current
supply current
supply current
Tamb = 10 to +60 °C
transient; VDD = 1.2 to 2.5 V
programming
programming
between motor pulses
between motor pulses;
VDD = 2.1 V
stop mode; pin 8 connected to
VDD
stop mode; pin 8 connected to
VDD; VDD = 2.1 V
VDD = 2.1 V;
Tamb = 10 to +60 °C
1.2 1.5
−−
5.0 5.1
0.55 0.6
170
190
180
220
−−
2.5 V
0.25 V
5.2 V
0.65 V
260 nA
300 nA
280 nA
360 nA
600 nA
1997 Dec 12
7

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