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| 型号： | PC34703PNB/R2 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 稳压器 |
| 英文描述： | 18 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, PQCC33 |
| 封装： | 10 X 10 MM, 2.1 MM HEIGHT, 0.8 PITCH, PLASTIC, QFN-33 |
| 文件页数： | 15/46页 |
| 文件大小： | 2509K |
| 代理商： | PC34703PNB/R2 |
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Analog Integrated Circuit Device Data
22
Freescale Semiconductor
34703
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
plus 10 ms. After a watchdog time-out, the function is no
longer active.
When the Window Watchdog function is selected, the
timer cannot be cleared during the Closed Window time,
which is 50% of the total watchdog period. When the
watchdog is cleared, the timer is reset and starts a new time-
out period. If the watchdog is not cleared during the Open
Window time, the RESET will become active (LOW) for a time
determined by the RC components of the RT timer plus
10 ms.
Figure 16. Watchdog Operation
Table 6. Watchdog Programming Command Byte
(as a 2nd Command Byte)
50% of Watchdog Period
Watchdog Period
Timing Selected via I2C Bus – See Table 1
Watchdog Closed
No Watchdog Clear Allowed
Window Open
for Watchdog Clear
Window Open for Watchdog Clear
Watchdog Period
Timing Selected via I2C Bus – See Table 1
Window Watchdog
Time-Out Watchdog
Address
Value
Action
01
1000
00
1st Command
01
1000
00
WD OFF
01
1010
00
WD 1280 ms
WinOFF
01
1010
01 WD 320 ms WinOFF
01
1010
10
WD 80 ms WinOFF
01
1010
11
WD 20 ms WinOFF
01
1011
00 WD 1280 ms WinON
01
1011
01
WD 320 ms WinON
01
1011
10
WD 80 ms
WinON
01
1011
11
WD 20 ms
WinON
Notes
27. The Watchdog feature will be turned ON
automatically after receiving any other valid
command byte changing watchdog time.
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