MAX7317 Maxim, MAX7317 Datasheet - Page 7

• Manufacturer Part Number: MAX7317
• Description: The MAX7317 serial-interfaced peripheral provides microprocessors with 10 I/O ports rated to 7V
• Manufacturer: Maxim

Multiple MAX7317s can be interfaced to a common SPI
bus by connecting DIN inputs together, SCLK inputs
Table 3. Input Ports Register
Table 4. Output Registers Format
Port P0 level
Port P0 is open-drain logic low
Port P0 is open-drain logic high (high
impedance without external pullup) or
logic input
Port P1 level
Port P2 level
Port P3 level
Port P4 level
Port P5 level
Port P6 level
Port P7 level
Port P8 level
Port P9 level
Writes ports P0 through P9
with same level
Reads port P0 level
Writes ports P0 through P3
with same level
Reads port P0 level
Writes ports P4 through P7
with same level
Reads port P4 level
Write ports P8 and P9 with same level
Read port P8 level
Read input ports P7–P0
Read input ports P9, P8
REGISTER
REGISTER
Connecting Multiple MAX7317s
Overvoltage and Hot-Insertion Protection
10-Port SPI-Interfaced I/O Expander with
_______________________________________________________________________________________
to the 4-Wire Bus
R/W
R/W
—-
—
—
—
—
—
—
—
—
—
—
—
1
1
0
1
0
1
0
1
0
1
ADDRESS
ADDRESS
CODE
CODE
(hex)
0X0E
(hex)
0x0C
0x0D
0X0F
0x0A
0x0B
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
MSB
MSB Port P1 level
MSB Port P2 level
MSB Port P3 level
MSB Port P4 level
MSB Port P5 level
MSB Port P6 level
MSB Port P7 level
MSB Port P8 level
MSB Port P9 level
MSB Ports P0 through P9 level
MSB Port P0 level
MSB Ports P0 through P3 level
MSB Port P0 level
MSB Ports P4 through P7 level
MSB Port P4 level
MSB Ports P8, P9 level
MSB Port P8 level
Port
D7
D7
P7
0
0
together, and providing an individual CS per the
MAX7317 device (Figure 2). This connection works
regardless of the configuration of DOUT/OSC, but does
not allow the MAX7317s to be read.
0
D6
Port
0
0
D6
P6
0
Output P0 level and PWM
D5
0
0
Port
D5
P5
0
REGISTER DATA
D4
REGISTER DATA
0
0
BINARY
Port
D4
P4
0
D3
0
0
Port
D3
P3
0
D2
0
0
Port
D2
P2
0
D1
0
0
Port
Port
D1
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
P1
P9
D0
0
1
0x00
0x01
0x00
0x01
Port
Port
hex
D0
P0
P8
or
7