MAX5316 MAXIM [Maxim Integrated Products], MAX5316 Datasheet - Page 24

• Manufacturer Part Number: MAX5316
• Manufacturer: MAXIM [Maxim Integrated Products]

The READY pulse appears 24 clock cycles after the neg-
ative edge of CS as shown in
be used as the CS line for the next device in the daisy
chain. Since the device looks at the first 24 bits of the
transmission following the falling edge of CS, it is pos-
sible to daisy-chain the device with different command
word lengths. READY goes high after CS is driven high.
To perform a daisy-chain write operation, drive CS low
and output the data serially to DIN. The propagation of
the READY signal then controls how the data is read by
the device. As the data propagates through the daisy
Table 5. SPI Command and Data Mapping with Clock Falling Edges
Note that ‘X’ is don’t care.
Figure 5. Daisy-Chain SPI Connection Terminating with a Standard SPI Device
CLOCK
EDGE
DIN
DOUT
Daisy-Chain SPI Operation Using READY Output
R3 R2 R1 R0 D15 D14 D13 D12 D11 D10 D9
1
0 R3 R2 R1 R0 D15 D14 D13 D12 D11 D10 D9
2
���������������������������������������������������������������� Maxim Integrated Products 24
3
µC
4
MISO
MOSI
SCK
I/O
5
Figure 5
16-Bit, ±1 LSB Accuracy Voltage Output
6
7
and can therefore
8
DOUT
DIN
SCLK
CS
9
SLAVE 1
READY
10
11
D8
12
chain, each individual command in the chain is executed
on the 24th falling clock edge following the falling edge
of the respective CS input. To update just one device
in a daisy chain, send the no-op command to the other
device in the chain. To update the first device in the
chain, raise the CS input after writing to that device.
Because daisy-chain operation requires paralleling the
DOUTs of all the MAX5316 in the chain, the NO_HOLDEN
bit in register 0x4 or 0xC should be set to 1 for all devices.
Doing so ensures that DOUT goes into high-impedance
after the SPI frame is complete (i.e. after the 24th clock
cycle) as shown in
D7
D8
13
DOUT
DIN
SCLK
CS
D6
D7
14
DAC with SPI Interface
SLAVE 2
READY
D5
D6
15
D4
D5
16
Figure
D3
D4
17
D2
D3
18
6.
D1
D2
19
POUT
DIN
SCLK
CS
D0
D1
20
SLAVE 3
MAX5316
READY
D0
21
X
22
X
X
23
X
X
24
X
X