Datasheet
MAX5803/MAX5804/MAX5805
Ultra-Small, Single-Channel, 8-/10-/12-Bit Buffered Output
Voltage DACs with Internal Reference and I
2
C Interface
21Maxim Integrated
one time; partial and/or multiple attempts to readback
executed in succession will not yield usable data.
I
2
C Compatibility
The MAX5803/MAX5804/MAX5805 are fully compatible
with existing I
2
C systems. SCL and SDA are high-
impedance inputs; SDA provides an open drain which
pulls the data line low to transmit data or ACK pulses.
Figure 8 shows a typical I
2
C application.
I
2
C User-Command Register Map
This section lists the user-accessible commands and
registers for the MAX5803/MAX5804/MAX5805.
Table 4 provides detailed information about the I
2
C
Command Registers.
Figure 7. Interface Verification I
2
C Register Read Sequences
SCL
A
W
20 19 18 17 A16 15 14 13 12 11 10 9 A8
SDA
0 0 1 1 0 A1 A0 2223 7 6 5 4 3 2 1 A0
R
~A
POINTER UPDATED
(QUALIFIES FOR COMBINED READ BACK)
COMMAND EXECUTED
(QUALIFIES FOR INTERFACE READ BACK)
SCL
SDA
COMMAND EXECUTED
(QUALIFIES FOR INTERFACE READ BACK)
POINTER UPDATED
(QUALIFIES FOR COMBINED READ BACK)
21
AW20191817A16 15 14 13 12 11 10 9A800110A1A02223 7654321A021
START STOP
WRITE ADDRESS
BYTE #1: I
2
C SLAVE ADDRESS
WRITE COMMAND
BYTE #2: COMMAND BYTE
(B[23:16])
WRITE DATA
BYTE #3: DATA HIGH BYTE
(B[15:8])
WRITE DATA
BYTE #4: DATA LOW BYTE
(B[7:0])
START STOP
WRITE ADDRESS
BYTE #1: I
2
C SLAVE ADDRESS
READ COMMAND
BYTE #2: COMMAND BYTE
(B[23:16])
READ DATA
BYTE #3: DATA HIGH BYTE
(B[15:8])
READ DATA
BYTE #4: DATA LOW BYTE
(B[7:0])
START
REPEATED
START
WRITE ADDRESS
BYTE #1: I
2
C SLAVE ADDRESS
WRITE COMMAND
BYTE #2: COMMAND BYTE
(B[23:16])
WRITE DATA
BYTE #3: DATA HIGH BYTE
(B[15:8])
WRITE DATA
BYTE #4: DATA LOW BYTE
(B[7:0])
STOP
WRITE ADDRESS
BYTE #1: I
2
C SLAVE ADDRESS
READ COMMAND
BYTE #2: COMMAND BYTE
(B[23:16])
READ DATA
BYTE #3: DATA HIGH BYTE
(B[15:8])
READ DATA
BYTE #4: DATA LOW BYTE
(B[7:0])
ACK. GENERATED BY MAX5803/MAX5804/MAX5805 ACK. GENERATED BY I
2
C MASTER
A20191817A16 15 14 13 12 11 10 9A800110A1A02223 7654321021
AR20191817A16 15 14 13 12 11 10 9A800110A1A02223 7654321~A021
AA