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參數(shù)資料
| 型號(hào)： | MC34701R2 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國(guó))有限公司 |
| 英文描述： | 1.5 A Switch-Mode Power Supply with Linear Regulator |
| 中文描述： | 1.5開關(guān)模式電源，線性穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 27/38頁(yè) |
| 文件大?。?/td> | 739K |
| 代理商： | MC34701R2 |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
27
34701
FUNCTIONAL DESCRIPTION
FUNCTIONAL DEVICE OPERATION
Security in Writing Commands
To improve the security level, a so-called
first command
is
defined to initiate each write communications. The first
command identifies the operation, which is executed by the
following Command Byte.
A first command has the 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.
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 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.
Figure 24. Voltage Margining Programming
(One Supply Only)
Note:
x bits, which set the voltage margining value are
defined in
Table 8
.
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 8
. See
Figure 25
for the
watchdog timer programming command example.
The internal watchdog timer is turned ON by receiving a
valid Watchdog Programming command (after receiving the
Watchdog Programming First Command), and it is cleared
each time the next Watchdog Programming command is
written into the device, provided it arrives during the window
open time. Thus, the Watchdog Programming command
clears the timer and sets the new timing conditions at the
same time. The Watchdog Programming First Command
01100000 sent twice shuts the timer OFF, and the watchdog
function is disabled. Any other valid watchdog command
turns the timer ON again.
Table 8.
Command Byte Definitions
Operation
Address
Value
Action
Voltage Margining
(As a 2nd
Command Byte)
0
0
1
0
0
0
0
0
1st Command
0
0
1
x
0
0
0
0
Output
Nominal
0
0
1
x
0
0
0
1
+ 1.0%
0
0
1
x
0
0
1
0
+ 2.0%
0
0
1
x
0
0
1
1
+ 3.0%
0
0
1
x
0
1
0
0
+ 4.0%
LDO Output: x=0
0
0
1
x
0
1
0
1
+ 5.0%
Switcher Output
x
=1
0
0
1
x
0
1
1
0
+ 6.0%
0
0
1
x
0
1
1
1
+ 7.0%
0
0
1
x
1
0
0
0
- 1.0%
0
0
1
x
1
0
0
1
- 2.0%
0
0
1
x
1
0
1
0
- 3.0%
0
0
1
x
1
0
1
1
- 4.0%
0
0
1
x
1
1
0
0
- 5.0%
0
0
1
x
1
1
0
1
- 6.0%
0
0
1
x
1
1
1
0
- 7.0%
Watchdog
Programming
(As a 2nd
Command Byte)
0
1
1
0
0
0
0
0
1st Command
0
1
1
0
0
0
0
0
WD OFF
(23)
0
1
1
0
1
0
0
0
WD 1280 ms
Wind. OFF
0
1
1
0
1
0
0
1
WD 320 ms
Wind. OFF
0
1
1
0
1
0
1
0
WD 80 ms
Wind. OFF
0
1
1
0
1
0
1
1
WD 20 ms
Wind. OFF
0
1
1
0
1
1
0
0
WD 1280 ms
Wind. ON
0
1
1
0
1
1
0
1
WD 320 ms
Wind. ON
0
1
1
0
1
1
1
0
WD 80 ms
Wind. ON
0
1
1
0
1
1
1
1
WD 20 ms
Wind. ON
Notes
23.
The Watchdog timer is turned ON automatically after
receiving any other valid command byte changing watchdog
time.
Table 9.
First Command Definitions
First Command
Operation
001 00000
Voltage Margining
011 00000
Watchdog Programming
0
0
0 0 0 0 0
1
0
0
1
x
x
x
x
x
First Byte for Voltage Margining
Command Byte
Ack
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