max5115eept Maxim Integrated Products, Inc., max5115eept Datasheet - Page 16

• Manufacturer Part Number: max5115eept
• Description: Nonvolatile, Quad, 8-bit Dacs With 2-wire Serial Interface
• Manufacturer: Maxim Integrated Products, Inc.

Nonvolatile, Quad, 8-Bit DACs with 2-Wire Serial
Interface
the device remains powered. The nonvolatile register
maintains data even after power is removed. The
MAX5115/MAX5116 start up (power first applied) by
transferring the mute/power-down from the nonvolatile
to the volatile control register. The nonvolatile control
register is set to 00 hex at the factory.
Power-on reset (POR) circuitry controls the initializa-
tion of the MAX5115/MAX5116. A power-on reset
loads the volatile registers with the data stored in the
nonvolatile registers.
Table 5. Volatile and Nonvolatile Read
Selection
Table 7. Mute/Power-Down Operation
*See Mute/Power-Down Control Register (Table 8).
Table 8. Mute/Power-Down Control Register
16
Write VCTL
Write NVCTL
Write VCTL
and NVCTL
Transfer
NVCTL to
VCTL
CONTROLLING
FUNCTION
NONVOLATILE
COMMAND
______________________________________________________________________________________
(NV)
0
1
S
T
A
R
T
S
S
S
S
Mute DAC3
VOLATILE
(MSB)
ADDRESS
D7
(V)
BYTE
1
0
R/
W
0
0
0
0
Read from VREG_
Read from NVREG_
Mute DAC2
A
C
K
D6
Power-On Reset
C
7
0
0
0
0
FUNCTION
C
6
0
0
0
0
COMMAND BYTE
C
5
0
1
1
0
Mute DAC1
C
4
1
0
1
0
D5
C
3
0
0
0
0
C
2
1
1
1
1
Mute DAC0
C
0
0
0
0
1
BIT IN REGISTER
C
0
0
0
0
0
D4
This initialization period takes 500µs (typ). During this
time, the DAC outputs are held in mute mode. At the
completion of the initialization period, the DAC outputs
update in accordance with the configuration register.
The 8-bit DAC data is decoded as offset binary, MSB
first, with 1 LSB = (V
ed into the corresponding analog voltage as shown in
Table 9.
Table 6. DAC Read Selection
A
C
K
R3
0
0
0
0
MSB
D
7
Power-down
D
6
Control register*
Control register*
Control register*
Control register*
DAC3
R2
D3
0
0
0
0
DATA BYTE
D
5
D
4
D
3
R1
0
0
1
1
Power-down
D
2
REFH_
DAC2
D2
D
1
LSB
R0
0
1
0
1
- V
D
0
REFL_
A
C
K
Power-down
DAC1
) / 256, and convert-
D1
FUNCTION
DAC0
DAC1
DAC2
DAC3
STOP
DAC Data
P
P
P
P
Power-down
(LSB)
DAC0
D0