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参数资料
| 型号： | KIT33702DWBEVB |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 28/39页 |
| 文件大小： | 0K |
| 描述： | KIT FEATURES THE MC34701 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，LDO 步降 |
| 输出及类型： | 2，非隔离 |
| 输入电压： | 2.8 ~ 6V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板，软件 |
| 已用 IC / 零件： | MC34702 |
| 相关产品： | MC34702EKR2CT-ND - IC POWER SUPPLY MCU 3A 32-SOIC MC34702EKR2TR-ND - IC POWER SUPPLY MCU 3A 32-SOIC MC34702EK-ND - IC POWER SUPPLY MCU 3A 32-SOIC |
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FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
address acknowledge sent by 34702. I 2 C bus protocol
0 0 1 0 0 0 0 0 Ack 0 0 1 x x x x x
defines this circumstance as a master-transmitter and slave-
receiver configuration.
First Byte for Voltage Margining
Command Byte
Figure 27 illustrates a communication beginning with the
slave address, the first command for voltage margining, and
Figure 24. Voltage Margining Programming
(One Supply Only)
Note: x bits, which set the voltage margining value are
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
a third byte containing the address field 001 and the value
field 00101 corresponding with the LDO fifth setting (LDO
output voltage = +5% above its nominal value). If a
simultaneous setting for switcher is needed, a fourth byte
should be included before the STOP condition (P); for
instance, 001 11100 to set the switcher in its twelfth setting
(switcher output voltage = -5% below its nominal value) - see
The example of data transfer setting the watchdog timer is
S A6 A5 A4 A3 A2 A1 A0 0 Ack
START Write
Slave Address
open time. Thus, the watchdog programming command
0
1
1
0
0
0
0
0 Ack
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
First Command for Watchdog Programming
function is disabled. Any other valid watchdog command
turns the timer ON again.
0 1 1 0 1 0
Address Field Value Field:
0
1 Ac k P
STOP
Time-out WD = 320 ms
(Window OFF)
0 1 1 0 0 0 0 0 Ack 0 1 1 x x x x x
First Byte for Watchdog Programming Command Byte
Figure 25. Watchdog Timer Programming
Figure 26. Data Transfer Example - Watch Dog Timer
Setting.
S A6 A5 A4 A3 A2 A1 A0 0 Ack
Note: x bits, which set the watchdog timer value are
START
Slave Address
Write
Communication Stop
0
0
1
0
0
0
0
0 Ack
Only the master can terminate the data transfer by issuing
a STOP condition. The slave waits for this condition to
resume its initial state waiting for the next START condition
First Command for Voltage Margining
(see Figure 26 ).
0
0
1
0
0
1
0
1 Ac k P
COMPLETE DATA TRANSFER EXAMPLES
The master device controlling the I 2 C bus always starts
Address Field Value Field = LDO
5th Setting
STOP
addressing a 34702 slave IC in writing mode (R/W = 0) to
enable it to write a command byte just after receiving the
Figure 27. Data Transfer Example - LDO Voltage
Margining
34702
Analog Integrated Circuit Device Data ?
28
Freescale Semiconductor
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