MAX7316AEE+ Maxim Integrated Products, MAX7316AEE+ Datasheet - Page 11

• Manufacturer Part Number: MAX7316AEE+
• Description: IC I/O EXPANDER I2C 16B 16QSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX7316AEE+

• Interface: I²C, SMBus
• Number Of I /o: 10
• Interrupt Output: Yes
• Frequency - Clock: 400kHz
• Voltage - Supply: 2 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 2. Register Address Map
The reset input RST is an active-low input. When taken
low, RST clears any transaction to or from the MAX7316
on the serial interface and configures the internal regis-
ters to the same state as a power-up reset (Table 3).
The MAX7316 then waits for a START condition on the
serial interface.
On power-up, and whenever the RST input is pulled
low, all control registers are reset and the MAX7316
enters standby mode (Table 3). Power-up status makes
all ports into inputs and disables both the PWM oscilla-
tor and blink functionality. RST can be used as a hard-
ware shutdown input, which effectively turns off any
LED (or other) loads and puts the device into its lowest
power condition.
The configuration register is used to configure the PWM
intensity mode, interrupt, and blink behavior, operate
the INT/O8 output, and read back the interrupt status
(Table 4).
The eight I/O ports P0 through P7 can be configured to
any combination of inputs and outputs using the ports
configuration register (Table 5). The INT/O8 output can
also be configured as an extra general-purpose output,
and the BLINK input can be configured as an extra
general-purpose input using the configuration register
(Table 4).
Control, Interrupt, and Hot-Insertion Protection
Outputs intensity P1, P0
Outputs intensity P3, P2
Outputs intensity P5, P4
Outputs intensity P7, P6
Blink phase 0 outputs
Blink phase 1 outputs
Master, O8 intensity
Ports configuration
Read input ports
Configuration
REGISTER
______________________________________________________________________________________
10-Port I/O Expander with LED Intensity
Detailed Description
Configuration Register
Ports Configuration
Initial Power-Up
Device Reset
ADDRESS CODE
(hex)
0x00
0x01
0x03
0x09
0x0E
0x0F
0x10
0x11
0x12
0x13
The input ports register is read only (Table 6). It reflects
the incoming logic levels of the ports, regardless of
whether the port is defined as an input or an output by the
ports configuration registers. Reading the input ports reg-
ister latches the current-input logic level of the affected
eight ports. A write to the input ports register is ignored.
All ports configured as inputs are always monitored for
changes in their logic status. The action of reading the
input ports register or writing to the configuration regis-
ter samples the corresponding 8 port bits’ input condi-
tion (Tables 4, 6). This sample is continuously
compared with the actual input conditions. A detected
change in input condition causes an interrupt condition.
The interrupt is cleared either automatically if the
changed input returns to its original state, or when the
input ports register is read, updating the compared
data (Figure 10). Randomly changing a port from an
output to an input may cause a false interrupt to occur
if the state of the input does not match the content of
the input ports register. The interrupt status is available
as the interrupt flag INT in the configuration register
(Table 4).
The input status of all ports are sampled immediately
after power-up as part of the MAX7316’s internal initial-
ization, so if all the ports are pulled to valid logic levels
at that time an interrupt does not occur at power-up.
AUTOINCREMENT
0x00 (no change)
0x01 (no change)
0x03 (no change)
0x09 (no change)
0x0E (no change)
0x0F (no change)
ADDRESS
Transition Detection
0x11
0x12
0x13
0x10
Input Ports
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