MAX5360/MAX5361/MAX5362
condition (Figure 6). The bus is then free for another
transmission.
SDA’s state is sampled, and therefore must remain sta-
ble while SCL is high. Data is transmitted in 8-bit bytes.
Nine clock cycles are required to transfer each byte to
the MAX5360/MAX5361/MAX5362. Release SDA during
the 9th clock cycle as the selected device acknowl-
edges the receipt of the byte, by pulling SDA low dur-
ing this time. A series resistor on the SDA line may be
needed if the master’s output is forced high while the
selected device acknowledges (Figure 4).
Slave Address
The MAX5360/MAX5361/MAX5362 are available with
one of four preset slave addresses. Each address
option is identified by the suffix L, M, N, or P added to
the part number. The address is defined as the 7 most
significant bits (MSBs) sent by the master after a
START condition. The address options are 0x60, 0x62,
0x64, and 0x66 (left justified with LSB set to 0). The 8th
bit, typically used to define a write or read protocol,
sets the device’s power mode (SHDN); the device is
powered down when SHDN is set to 1. During a device
search routine, the MAX5360/MAX5361/MAX5362
acknowledge both options (SHDN = 0 or SHDN = 1)
but does not change its power state if a stop condition
(or restart) is issued immediately. The second byte
(DAC data) must be sent/received for the device to
update both power mode and DAC output.
DAC Data
The 6-bit DAC data is decoded as straight binary MSB
first with 1LSB = (V
REF
/ 64) and converted into the cor-
responding analog voltage as shown in Table 1. Two
subbits complete the data byte; these 2 bits should be
set to zero since they are not tested to guaranteed-
monotonic performance.
After receiving the data byte, the MAX5360/MAX5361/
MAX5362 acknowledge its receipt and expect a STOP
condition, at which point the DAC output is updated.
The devices update the output and the power mode
only if the second byte is clocked in (SHDN = 0) or out
(SHDN = 1) of the device. When SHDN = 1, the master
will read all ones when clocking out a data byte. The
MAX5360/MAX5361/MAX5362 do not drive SDA except
for the acknowledge bit.
Low-Cost, Low-Power 6-Bit DACs with
2-Wire Serial Interface in SOT23 Package
10 ______________________________________________________________________________________
