參數(shù)資料
型號(hào)： PC33702DWBR2
廠商： MOTOROLA INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： 6 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, PDSO32
封裝： PLASTIC, SOIC-32
文件頁(yè)數(shù)： 13/24頁(yè)
文件大?。?/td> 647K
代理商： PC33702DWBR2
33702
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
20
Table 5. Command Byte Definitions
Security in Writing Commands
All writing operations are critical and must not be
inadvertently latched after a false command. To improve the
security level, a so-called first command is defined to initiate
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 6 summarizes first command definitions. The
master sends the first command before the Command Byte for
the intended operation.
Voltage Margining Operation
After starting the communication in Writing mode, the master
sends the first command followed by the specific Command
Byte to set the required voltage margining for either the LDO or
the switcher (see Figure 17). 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.
Figure 17. Voltage Margining Programming
(One Supply Only)
Note x bits are defined in Table 5.
Watchdog Programming Operation
For watchdog operation control, the master periodically
sends a watchdog first command followed by a command byte
selecting, or confirming, the watchdog period according to the
options listed in Table 5. Also see Figure 18.
The internal watchdog timer will be cleared each time a
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.
Figure 18. Watchdog Timer Programming
Note x bits are defined in Table 5.
Operation
Address
Value
Action
Voltage Margining
(As a 2nd
Command Byte)
00
100
000
1st Command
00
1
x
0
000 Output Normal
00
1
x
0
001
+ 1%
00
1
x
0
010
+ 2%
00
1
x
0
011
+ 3%
00
1
x
0
100
+ 4%
LDO Output: x=0
0
1
x
0
1
0
1
+ 5%
Switcher Output
x=1 00
1
x
0
110
+ 6%
00
1
x
0
111
+ 7%
00
1
x
1
001
- 1%
00
1
x
1
010
- 2%
00
1
x
1
011
- 3%
00
1
x
1
100
- 4%
00
1
x
1
101
- 5%
00
1
x
1
110
- 6%
00
1
x
1
111
- 7%
Watchdog
Programming
(As a 2nd
Command Byte)
01
100
000
1st Command
01
100
000
WD OFF
0
1
0
1
0
WD 1280 ms
WinOFF
0
1
0
1
0
1
WD 320 ms
WinOFF
01
101
010
WD 80 ms
WinOFF
01
101
011
WD 20 ms
WinOFF
0
1
0
1
0
WD 1280 ms
WinON
0
1
0
1
0
1
WD 320 ms
WinON
01
101
110
WD 80 ms
WinON
01
101
111
WD 20 ms
WinON
Notes
13.
The Watchdog feature will be turned ON automatically
after receiving any other valid command byte changing
watchdog time.
Table 6. First Command Definitions
First Command
Operation
001 00000
Voltage Margining
011 00000
Watchdog Programming
00
0 0 0 0 0
10
01
x
First Byte for Voltage Margining
Command Byte
Ack
01
0 0 0 0 0
11
01
x
First Byte for Watchdog Programming
Command Byte
Ack
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