LTC2979
15
2979f
For more information www.linear.com/LTC2979
OPERATION
Overview
The LTC2979 contains two independent LTC2977 devices.
Each half of the LTC2979 behaves the same as a stand-
alone LTC2977, including independent power supply and
ground pins, with the following exceptions:
n
The V
PWR
pin has been removed and replaced with an
additional V
DD33
pin.
n
The LTC2979 can only be powered from 3.3V.
n
The V
OUT_EN
and V
IN_EN
pins are limited to 6V.
n
The ADC Total Unadjusted Error (TUE_ADC_VOLT_
SNS) is 0.5%.
Refer to the LTC2977 data sheet for a detailed description
of the device operation, the PMBus command set, and
applications information.
Device Address
Since the LTC2979 consists of two independent LTC2977
devices, each half of the LTC2979 must be configured
for a unique address. The I
2
C/SMBus addresses of the
LTC2979 are configured in the same manner as for indi-
vidual LTC2977 devices. The LTC2979 also responds
to the LTC2977 global address and the SMBus alert
response address, regardless of the state of the ASEL
pins and the MFR_I2C_BASE_ADDRESS register. Please
refer to the Device Address section in the LTC2977 data
sheet for more details.
MFR_SPECIAL_ID
The LTC2979 contains unique MFR_SPECIAL_ID val-
ues to differentiate it from the LTC2977. Table 1 lists the
MFR_SPECIAL_ID values for the LTC2979.
Table 1. LTC2979 MFR_SPECIAL_ID Values
LTC2979 DEVICE MFR_SPECIAL_ID
Device A 0x8061
Device B 0x8071
