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參數(shù)資料
| 型號： | PCA1487 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 32 kHz watch circuits with adaptive motor pulse |
| 中文描述： | 32千赫的自適應(yīng)電機(jī)脈沖手表電路 |
| 文件頁數(shù)： | 11/20頁 |
| 文件大小： | 118K |
| 代理商： | PCA1487 |
1998 Apr 21
11
Philips Semiconductors
Product specification
32 kHz watch circuits with adaptive motor
pulse
PCA148x series
Power-on reset
For correct operation of the Power-on reset the rise time of
V
DD
from 0 V to 2.1 V should be less than 0.1 ms.
All resettable flip-flops are reset. Additionally the polarity of
the first motor pulse is positive: V
M1
V
M2
≥
0 V.
Customer testing
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
V
DD
.
Connecting the RESET to V
DD
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. A 32 Hz
signal without jitter is produced at the TEST pin. Debounce
time RESET = 14.7 to 123.2 ms.
Connecting RESET to V
SS
activates Tests 1 and 2 and
disables the inhibition.
Test 1, V
DD
> V
EOL
. Normal function takes place except
that the motor pulse period is t
T1
= 125 ms instead of t
T
,
and the motor pulse stage is reduced every second
instead of every 8 minutes. At TEST a speeded-up
8 minute signal is available.
Test 2, V
DD
< V
EOL
. Motor pulses of stage 6 are produced,
with a time period of t
T2
= 31.25 ms.
Test and reset modes are terminated by disconnecting the
RESET pin.
Test 3, V
DD
> 5.1 V
. Motor pulses without chopping are
produced, with a time period of t
T3
= 31.25 ms and
n
×
122
μ
s to check the contents of the EEPROM.
At TEST a speeded-up cycle for motor pulse period signal
t
T
is available at 1024 times its normal frequency.
Decreasing V
DD
voltage level to lower than 2.5 V between
two motor pulses returns the circuit to normal operating
conditions.
AVAILABLE TYPES
Refer to Chapters “Ordering information” and “Functional description and testing”.
Note
1.
U = Chip in trays; U/5 = wafer; U/7 = chip with bumps on tape.
SHORT
TYPE
NUMBER
DELIVERY
FORMAT
(1)
PERIOD
t
T
(s)
SPECIFICATIONS
PULSE
WIDTH
t
P
(ms)
DRIVE
(%)
DETECTION
CRITERION
EEPROM
BATTERY
EOL
DETECTION
REMARKS
1485
U/7
1
5.8
75
P = 1
N = 2
P = 1
N = 2
P = 2
N = 3
yes
yes
1486
U/7
1
5.8
75
yes
no
1487
U/5
1
7.8
75
yes
yes
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相關(guān)代理商/技術(shù)參數(shù) |
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| PCA1487U/10 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:32 kHz watch circuits with adaptive motor pulse |
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