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參數(shù)資料
| 型號： | E1217X |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 時鐘及定時 |
| 英文描述： | 32 KHZ STANDARD WATCH CMOS IC |
| 中文描述： | STEPPING MOTOR WATCH, UUC8 |
| 封裝： | DIE |
| 文件頁數(shù)： | 3/8頁 |
| 文件大小： | 117K |
| 代理商： | E1217X |
3
e1217X
4728A–CLOCK–06/03
Functional Description
Voltage Regulator
An integrated voltage regulator provides the oscillator with a well-controlled negative
supply voltage V
REG
. This improves the stability of the oscillator and keeps current con-
sumption at a minimum.
Oscillator
The oscillator inverter with feedback resistor generates the 32768 Hz clock frequency. A
total capacitance of 24 pF is integrated. This can be selected for COSCOUT in 2 pF
increments via a mask option.
Frequency Divider
A 21-bit binary counter is provided, dividing the oscillator frequency down to 1/64 Hz.
The leading six stages are connected to V
DD
and V
REG
, while the remaining 15 stages
are connected to V
DD
and V
SS
.
Motor Drive Output
The e1217X contains two push-pull output buffers for driving bipolar stepping motors.
During a motor pulse, the n-channel device of one buffer and the p-channel device of
the other buffer are activated. The p-channel devices of both buffers are active (see Fig-
ure 3) between the two pulses.
Cycle time and pulse width can be chosen via a metal mask option (Table 1).
RESET
A debounced RESET input is provided. Connecting the RESET input to V
DD
resets the
12 low-order stages of the frequency divider, thus disabling further motor pulses. Motor
pulses, which are in progress when the reset function is applied, will be completed. After
releasing the RESET pad from V
DD
, the next motor pulse appears with a delay of one
half motor cycle on the drive output opposed to the former (Figure 4). Due to the
debounce circuitry on the RESET input, V
DD
must be applied for at least 31.2 ms. Dur-
ing RESET the input current is limited to 8 nA typically.
Test
A test frequency of 512 Hz is output to this pad which can be measured with a high
resistance probe (R 10 M , C 20 pF). This signal can be used for testing and tuning
the oscillator. Connecting TEST to V
DD
for at least 4 ms changes the motor cycle time
from the selected value to the test cycle time (mask options), while the motor pulse
width remains unchanged (Figure 3).
This feature can be used to reduce the amount of time required for testing the mechani-
cal parts of the watch.
Table 1.
Motor Options
Motor-cycle Parameters
Value
Cycle time T
M
Motor pulse width t
M
Motor test cycle time T
MT
2, 4, 6, 8, 10, 12, 20, 24, 30, 40, 60, 80, 120 s
0.98 to 14.65 ms in increments of 0.98 ms
250, 125, 62.5 ms
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| E1217X-B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Watch Circuit |
| E1217X-E | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Watch Circuit |
| E1217X-I | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Watch Circuit |
| E1217X-S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Watch Circuit |
| E1217X-VA | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Watch Circuit |
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