KIT33701DWBEVB Freescale Semiconductor, KIT33701DWBEVB Datasheet - Page 28

• Manufacturer Part Number: KIT33701DWBEVB
• Description: KIT FOR 33701 POWER SUPPLY
• Manufacturer: Freescale Semiconductor
• Type: LDO Controllers & Regulatorsr

Specifications of KIT33701DWBEVB

• Main Purpose: DC/DC, Step Down with LDO
• Outputs And Type: 2, Non-Isolated
• Voltage - Input: 2.8 ~ 6V
• Regulator Topology: Buck
• Frequency - Switching: 300kHz
• Board Type: Fully Populated
• Utilized Ic / Part: MC34701
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Voltage - Output: -
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: 34701

defined in
WATCHDOG PROGRAMMING OPERATION
sends a watchdog first command followed by a command
byte selecting, or confirming, the watchdog period according
to the options listed in
watchdog timer programming command example.
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.
defined in
Communication Stop
a STOP condition. The slave waits for this condition to
resume its initial state waiting for the next START condition
(see
COMPLETE DATA TRANSFER EXAMPLES
addressing a 34701 slave IC in writing mode (R/W = 0) to
enable it to write a command byte just after receiving the
28
34701
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Note: x bits, which set the voltage margining value are
For watchdog operation control, the master periodically
The internal watchdog timer is turned ON by receiving a
Note: x bits, which set the watchdog timer value are
Only the master can terminate the data transfer by issuing
The master device controlling the I
First Byte for Watchdog Programming Command Byte
First Byte for Voltage Margining
Figure
0 0
0 1
Figure 24. Voltage Margining Programming
Figure 25. Watchdog Timer Programming
Table
Table
26).
1
1
0 0 0 0 0
0 0 0 0 0
8.
8, page 27.
(One Supply Only)
Table
8. See
Ack
Ack
0
0
Figure 25
0
1
2
Command Byte
C bus always starts
1
1
x
x
x
x
for the
x
x
x
x
x
x
address acknowledge sent by 34702. I
defines this circumstance as a master-transmitter and slave-
receiver configuration.
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
shown in the
START
START
Figure 26. Data Transfer Example - Watch Dog Timer
Figure 27
The example of data transfer setting the watchdog timer is
Figure 27. Data Transfer Example - LDO Voltage
S
S
28.
A6
A6
A5
A5
illustrates a communication beginning with the
First Command for Watchdog Programming
First Command for Voltage Margining
Figure
Slave Address
Slave Address
A4
A4
0
0
A3 A2 A1
A3 A2 A1
1
0
26.
Address Field Value Field:
Address Field Value Field = LDO
1
1
Analog Integrated Circuit Device Data
Margining
0
0
0
0
Setting.
1
0
A0
A0
0
0
1
1
0
0
0
0
Write
Write
Freescale Semiconductor
0
0
Ack
Ack
Time-out WD = 320 ms
(Window OFF)
5th Setting
0
0
2
1
0
0
0
C bus protocol
Ack
Ack
0
1
0
0
1
1
Ack
Ack
STOP
STOP
P
P