参数资料
| 型号： | MC34703PNB |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 26/46页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUPPLY QUICC 33-QFN |
| 标准包装： | 1 |
| 应用： | 电源 |
| 电流 - 电源： | 60mA |
| 电源电压： | 2.8 V ~ 13.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 33-PowerQFN |
| 供应商设备封装： | 33-PQFN（10x10） |
| 包装： | 管件 |
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FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
Security in Writing Commands
Table 10. Command Byte Definitions
All writing operations are critical and must not be
Operation
Address
Value
Action
inadvertently latched after a false command. To improve the
Voltage Margining 0
0
1
0
0
0
0
0 1st Command
security level, a so-called first command is defined to initiate
(As a 2nd
0
0
1
x
0
0
0
0 Output Normal
each write communications.
A first command has the Command Byte address field
equal to the related operation one, followed by a null value
field (all zeros). Table 9 summarizes first command
definitions. The master sends the first command before the
Command Byte for the intended operation.
Table 9. First Command Definitions
Command Byte)
LDO Output: x = 0
Switcher Output
x=1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
x
x
x
x
x
x
0
0
0
0
0
0
0
0
0
1
1
1
0
1
1
0
0
1
1
0
1
0
1
0
+ 1%
+ 2%
+ 3%
+ 4%
+ 5%
+ 6%
First Command
001 00000
011 00000
Operation
Voltage Margining
Watchdog Programming
0
0
0
0
0
0
0
0
1
1
1
1
x
x
x
x
0
1
1
1
1
0
0
0
1
0
1
1
1
1
0
1
+ 7%
- 1%
- 2%
- 3%
Voltage Margining Operation
After starting the communication in Writing mode, the
master sends the first command followed by the specific
0
0
0
0
0
0
1
1
1
x
x
x
1
1
1
1
1
1
0
0
1
0
1
0
- 4%
- 5%
- 6%
Command Byte to set the required voltage margining for
either the LDO or the switcher (see Figure 24 ). To achieve a
simultaneous set for both LDO and switcher, two specific
commands must be issued in sequence after the first
command, one for each supply.
Watchdog
Programming
(As a 2nd
Command Byte)
0
0
0
0
0
1
1
1
1
1
1
1
x
0
0
0
1
0
0
1
1
0
0
0
1
0
0
0
1 - 7%
0 1st Command
0 WD OFF
(28)
0
WD 1280 ms
0 0 1 0 0 0 0 0 Ack 0 0 1 x x x x x
0
1
1
0
1
0
0
1
WinOFF
WD 320 ms
First Byte for Voltage Margining
Command Byte
WinOFF
0
1
1
0
1
0
1
0
WD 80 ms
Figure 24. Voltage Margining Programming
WinOFF
(One Supply Only)
0
1
1
0
1
0
1
1
WD 20 ms
WinOFF
0
1
1
0
1
1
0
0
WD 1280 ms
Watchdog Programming Operation
WinON
For watchdog operation control, the master periodically
0
1
1
0
1
1
0
1
WD 320 ms
sends a watchdog first command followed by a command
WinON
byte selecting, or confirming, the watchdog period according
0
1
1
0
1
1
1
0
WD 80 ms
WinON
The internal watchdog timer will be cleared each time a
0
1
1
0
1
1
1
1
WD 20 ms
watchdog command is written into the device, provided it
arrives during the window open time. The Command
01100000 sent twice will shut the time OFF, and the
watchdog function will be disabled. Any other valid watchdog
command turns on the timer again.
0 1 1 0 0 0 0 0 Ack 0 1 1 x x x x x
WinON
Notes
28. The Watchdog feature will be turned ON automatically after
receiving any other valid command byte changing watchdog
time.
First Byte for Watchdog Programming
Command Byte
Figure 25. Watchdog Timer Programming
34703
Analog Integrated Circuit Device Data
26
Freescale Semiconductor
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