MAX7313ATG-T Maxim Integrated, MAX7313ATG-T Datasheet - Page 11

• Manufacturer Part Number: MAX7313ATG-T
• Description: Interface - I/O Expanders 16-Bit I/O Port Expander
• Manufacturer: Maxim Integrated
• Series: MAX7313r

Specifications of MAX7313ATG-T

• Maximum Operating Frequency: 400 KHz
• Operating Supply Voltage: 2 V to 3.6 V
• Operating Temperature Range: - 40 C to + 125 C
• Mounting Style: SMD/SMT
• Package / Case: TQFN-24 EP
• Output Current: 50 mA
• Power Dissipation: 761 mW

Figure 7. Command Byte Received
Figure 8. Command and Single Data Byte Received
Figure 9. n Data Bytes Received
Any bytes received after the command byte are data
bytes. The first data byte goes into the internal register
of the MAX7313 selected by the command byte (Figure
8). If multiple data bytes are transmitted before a STOP
condition is detected, these bytes are generally stored
in subsequent MAX7313 internal registers because the
command byte address autoincrements (Table 2). A
diagram of a write to the output ports registers (blink
phase 0 registers or blink phase 1 registers) is given in
Figure 10.
The MAX7313 is read using the MAX7313’s internally
stored command byte as an address pointer the same
way the stored command byte is used as an address
pointer for a write. The pointer autoincrements after
each data byte is read using the same rules as for a
write (Table 2). Thus, a read is initiated by first configur-
ing the MAX7313’s command byte by performing a
write (Figure 7). The master can now read n consecu-
Control, Interrupt, and Hot-Insertion Protection
S
S
HOW COMMAND BYTE AND DATA BYTE MAP INTO
HOW COMMAND BYTE AND DATA BYTE MAP INTO
S
______________________________________________________________________________________
ACKNOWLEDGE FROM MAX7313
SLAVE ADDRESS
ACKNOWLEDGE FROM MAX7313
SLAVE ADDRESS
16-Port I/O Expander with LED Intensity
MAX7313'S REGISTERS
Message Format for Reading
MAX7313'S REGISTERS
COMMAND BYTE IS STORED ON RECEIPT OF
SLAVE ADDRESS
R/W
R/W
ACKNOWLEDGE FROM MAX7313
0
0
A
A
D15 D14 D13 D12 D11 D10
STOP CONDITION
D15 D14 D13 D12 D11 D10
R/W
0
ACKNOWLEDGE FROM MAX7313
COMMAND BYTE
ACKNOWLEDGE FROM MAX7313
COMMAND BYTE
A
D15
tive bytes from the MAX7313 with the first data byte
being read from the register addressed by the initial-
ized command byte. When performing read-after-write
verification, remember to reset the command byte’s
address because the stored command byte address
has been autoincremented after the write (Table 2). A
diagram of a read from the input ports registers is
shown in Figure 10 reflecting the states of the ports.
If the MAX7313 is operated on a 2-wire interface with
multiple masters, a master reading the MAX7313 should
use a repeated start between the write, which sets the
MAX7313’s address pointer, and the read(s) that takes
the data from the location(s) (Table 2). This is because it
is possible for master 2 to take over the bus after master
1 has set up the MAX7313’s address pointer but before
master 1 has read the data. If master 2 subsequently
changes the MAX7313’s address pointer, then master
1’s delayed read can be from an unexpected location.
D14
D9
D9
D13
D8
D8
COMMAND BYTE
A
D12
A
ACKNOWLEDGE FROM MAX7313
Operation with Multiple Masters
D7
D7
D11
AUTOINCREMENT MEMORY ADDRESS
AUTOINCREMENT MEMORY ADDRESS
D6
D6
D10
D5
D5
ACKNOWLEDGE FROM MAX7313
ACKNOWLEDGE FROM MAX7313
DATA BYTE
DATA BYTE
D4
D9
D4
BYTES
BYTE
N
1
D3
D3
D8
D2
D2
A
D1
D1
P
D0
D0
A
A
P
P
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