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LTC4449 Datasheet(PDF) 35 Page - Analog Devices

Part # LTC4449
Description  Quad-Phase, Synchronous Bidirectional Buck or Boost Controller
PDF  48 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
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LTC4449 Datasheet(HTML) 35 Page - Analog Devices

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LTC7872
35
Rev. 0
For more information www.analog.com
Multidrop Configuration
Several LTC7872s may share the serial bus. In this multidrop configuration, SCLK, SDI, and SDO are common between
all parts. The serial bus master must use a separate CSB for each LTC7872 and ensure that only one device has CSB
asserted at any time during the serial port read sequence. It is recommended to attach a high value resistor to SDO to
ensure the line returns to a known level during Hi-Z states.
Serial Port Register Definition
Table 7. Register Summary
Register NAME
Register
Address
(7 bits)
Description
TYPE
DEFAULT
VALUE
MFR_FAULT
0x01
One byte summary of the unit’s fault condition.
R
MFR_OC_FAULT
0x02
One byte summary of the unit’s overcurrent fault condition.
R
MFR_NOC_FAULT
0x03
One byte summary of the unit’s negative overcurrent fault condition.
R
MFR_STATUS
0x04
One byte summary of the unit’s operation status.
R
MFR_CONFIG1
0x05
One byte summary of the unit’s configuration
R
MFR_CONFIG2
0x06
One byte summary of the unit’s configuration
R
MFR_CHIP_CTRL
0x07
[3] = Communication Fault, [1] = Sticky Bit, [0] = Write Protection
R/W
0x00
MFR_IDAC_VLOW
0x08
Adjust the IDAC_VLOW to program VLOW voltage.
R/W
0x00
MFR_IDAC_VHIGH
0x09
Adjust the IDAC_VHIGH to program VHIGH voltage.
R/W
0x00
MFR_IDAC_SETCUR
0x0A
Adjust the IDAC_SETCUR to program SETCUR pin’s sourcing current.
R/W
0x00
MFR_SSFM
0x0B
Adjust the spread spectrum frequency modulation parameters.
R/W
0x00
RESERVED
0x0C
0x0D
0x0E
0x0F
SERIAL PORT REGISTER DETAILS
MFR_FAULT
The MFR_FAULT returns a one-byte summary of the most critical faults.
MFR_FAULT Register Contents:
BIT
NAME
VALUE MEANING
7
Reserved
6
VLOW_OV
1
The OVLOW pin is higher than 1.2V threshold.
5
VHIGH_OV
1
The OVHIGH pin is higher than 1.2V threshold.
4
VHIGH_UV
1
The UVHIGH pin is less than 1.2V threshold.
3
DRVCC_UV
1
The DRVCC pin is undervoltage.
2
V5_UV
1
The V5 pin is undervoltage.
1
VREF_BAD
1
The internal reference self-check fails.
0
OVER_TEMP
1
An over temperature fault has occurred.
APPLICATIONS INFORMATION



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