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MC34701EK Datasheet

  • MC34701EK

  • Freescale Semiconductor, Inc [1.5 A Switch-Mode Power Suppl...

  • FREESCALE

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FUNCTIONAL DESCRIPTION
FUNCTIONAL DEVICE OPERATION
S
A6 A5 A4 A3 A2 A1 A0 0 Ack
0 1 1 0 0 0 0 0 Ack 0 1 1 x x x x x
First Byte for Watchdog Programming Command Byte
START
Slave Address
Write
Figure 25. Watchdog Timer Programming
Note:
x bits, which set the watchdog timer value are
defined in
Table 8,
page
27.
Communication Stop
0
0
1
0
0
0
0
0 Ack
First Command
for Voltage Margining
0
0
1
0
0
1
0
1 Ack
P
STOP
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
(see
Figure 26).
Address Field Value Field = LDO
5th Setting
Figure 27. Data Transfer Example - LDO Voltage
Margining
COMPLETE DATA TRANSFER EXAMPLES
The master device controlling the I
2
C bus always starts
addressing a 34701 slave IC in writing mode (R/W = 0) to
enable it to write a Command Byte just after receiving the
address acknowledge sent by 34702. I
2
C bus protocol
defines this circumstance as a master-transmitter and slave-
receiver configuration.
Figure 27
illustrates a communication beginning with the
slave address, the
first command
for voltage margining, and
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
Figure 28.
The example of data transfer setting the Watchdog timer is
shown in the
Figure 26.
S
A6 A5 A4 A3 A2 A1 A0 0 Ack
START
Slave Address
Write
0
0
1
0
0
0
0
0 Ack
First Command
for Voltage Margining
0
0
1
0
0
1
0
1 Ack
Address Field Value Field: LDO
V
LDO
= Nom. + 5%
0
0
1
1
1
1
0
0 Ack
P
STOP
Address Field Value Field: Switcher
V
OUT
= Nom. - 5%
Figure 28. Data Transfer Example - LDO and Switcher
Voltage Margining
S
A6 A5 A4 A3 A2 A1 A0 0 Ack
START
Slave Address
Write
0
1
1
0
0
0
0
0 Ack
First Command
for Watchdog Programming
0
1
1
0
1
0
0
1 Ack
P
STOP
Address Field Value Field:
Time-out WD = 320 ms
(Window OFF)
Figure 26. Data Transfer Example - Watch Dog Timer
Setting.
34701
28
Analog Integrated Circuit Device Data
Freescale Semiconductor

MC34701EK 產(chǎn)品屬性

  • 42

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 專用型

  • -

  • 轉(zhuǎn)換器，F(xiàn)reescale 電源 QUICC? I，II

  • 2.8 V ~ 6 V

  • 1

  • 可調(diào)

  • -40°C ~ 85°C

  • 表面貼裝

  • 32-SOIC（0.295"，7.50mm 寬）

  • 32-SOIC

  • 管件

  • KIT33701DWBEVB-ND - KIT FOR 33701 POWER SUPPLY

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