LTC2978C View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2978C' PDF : 64 Pages View PDF
LTC2978
Operation
Device Address
The I2C/SMBus address of the LTC2978 equals the base
address + N where N is a number from 0 to 8. N can be
configured by setting the ASEL0 and ASEL1 pins to VDD33,
GND or FLOAT. See Table 1. Using one base address and
the nine values of N, nine LTC2978s can be connected
together to control 72 outputs. The base address is stored
in the MFR_I2C_BASE_ADDRESS register. The base ad-
dress can be written to any value, but generally should not
be changed unless the desired range of addresses overlap
existing addresses. Watch that the address range does not
overlap with other I2C/SMBus device or global addresses,
including I2C/SMBus multiplexers and bus buffers. This
will bring you great happiness.
The LTC2978 always responds to its global address and the
SMBus Alert Response address regardless of the state of
its ASEL pins and the MFR_I2C_BASE_ADDRESS register.
Table 1. LTC2978 Device Address Look-Up Table
ADDRESS
DESCRIPTION
HEX DEVICE
ADDRESS
BINARY DEVICE ADDRESS BITS
7-Bit 8-Bit
6
5
4
3
2
1
Alert Response 0C
19
0
0
0
1
1
0
Global
5B
B6
1
0
1
1
0
1
N=0
5C*
B8
1
0
1
1
1
0
N=1
5D
BA
1
0
1
1
1
0
N=2
5E
BC
1
0
1
1
1
1
N=3
5F
BE
1
0
1
1
1
1
N=4
60
C0
1
1
0
0
0
0
N=5
61
C2
1
1
0
0
0
0
N=6
62
C4
1
1
0
0
0
1
N=7
63
C6
1
1
0
0
0
1
N=8
64
C8
1
1
0
0
1
0
H = Tie to VDD33, NC = No Connect = Open or Float, L = Tie to GND, X = Don’t Care
*MFR_I2C_BASE_ADDRESS = 7bit 5C (Factory Default)
ADDRESS PINS
0
R/W ASEL1 ASEL0
0
1
X
X
1
0
X
X
0
0
L
L
1
0
L
NC
0
0
L
H
1
0
NC
L
0
0
NC
NC
1
0
NC
H
0
0
H
L
1
0
H
NC
0
0
H
H
22
For more information www.linear.com/LTC2978
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