MAX5822MEUA+ Maxim Integrated Products, MAX5822MEUA+ Datasheet - Page 9

• Manufacturer Part Number: MAX5822MEUA+
• Description: IC DAC 12BIT DL 2WIRE SER 8-UMAX
• Manufacturer: Maxim Integrated Products

Specifications of MAX5822MEUA+

• Settling Time: 4µs
• Number Of Bits: 12
• Data Interface: Serial
• Number Of Converters: 2
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Number Of Dac Outputs: 2
• Resolution: 12 bit
• Interface Type: Serial (I2C)
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Supply Current: 215 uA
• Voltage Reference: External
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power Dissipation (max): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Figure 2. START and STOP Conditions
Figure 3. Early STOP Conditions
The acknowledge bit (ACK) is the ninth bit attached to
any 8-bit data word. ACK is always generated by the
receiving device. The MAX5822 generates an ACK
when receiving an address or data by pulling SDA low
during the ninth clock period. When transmitting data,
the MAX5822 waits for the receiving device to generate
an ACK. Monitoring ACK allows for detection of unsuc-
cessful data transfers. An unsuccessful data transfer
occurs if a receiving device is busy or if a system fault
has occurred. In the event of an unsuccessful data
transfer, the bus master should reattempt communica-
tion at a later time.
A bus master initiates communication with a slave
device by issuing a START condition followed by the 7-
bit slave address (Figure 4). When idle, the MAX5822
SDA
SCL
SCL
SDA
SCL
SDA
S
_______________________________________________________________________________________
LEGAL STOP CONDITION
ILLEGAL EARLY STOP CONDITION
START
STOP
Dual, 12-Bit, Low-Power, 2-Wire, Serial
S
ILLEGAL
START
r
STOP
Acknowledge Bit (ACK)
Slave Address
P
waits for a START condition followed by its slave
address. The serial interface compares each address
value bit by bit, allowing the interface to power down
immediately, if an incorrect address is detected. The
LSB of the address word is the Read/Write (R/W) bit.
R/W indicates whether the master is writing to or read-
ing from the MAX5822 (R/W = 0 selects the write condi-
tion, R/W = 1 selects the read condition). After
receiving the proper address, the MAX5822 issues an
ACK by pulling SDA low for one clock cycle.
The MAX5822 has four different factory/user-pro-
grammed addresses (Table 2). Address bits A6
through A1 are preset, while A0 is controlled by ADD.
Connecting ADD to GND sets A0 = 0. Connecting ADD
to V
MAX5822s to share the same bus.
In write mode (R/W = 0), data that follows the address
byte controls the MAX5822 (Figure 5). Bits C3–C0 con-
figure the MAX5822 (Table 3). Bits D11–D0 are DAC
data. Input and DAC registers update on the falling
edge of SCL during the acknowledge bit. Should the
write cycle be prematurely aborted, data is not updated
and the write cycle must be repeated. Figure 6 shows
two example write data sequences.
The MAX5822 features an extended command mode
that is accessed by setting C3–C0 = 1 and D11–D8 =
0. The next data byte writes to the shutdown registers
Table 2. MAX5822 I
Figure 4. Slave Address Byte Definition
Figure 5. Command Byte Definition
MAX5822M
MAX5822M
MAX5822L
MAX5822L
DD
PART
Voltage-Output DAC
S
sets A0 = 1. This feature allows up to four
C3
A6
C2
A5
C1
V
GND
GND
A4
V
V
ADD
DD
DD
C0
2
C Slave Addresses
A3
Extended Command Mode
D11
A2
D10
DEVICE ADDRESS
Write Data Format
A1
D9
0111 000
0111 001
1011 000
1011 001
(A6...A0)
A0
D8
R/W
9