MCP23018-E/MJ Microchip Technology, MCP23018-E/MJ Datasheet - Page 10

• Manufacturer Part Number: MCP23018-E/MJ
• Description: IC I/O EXPANDER I2C 16B 24QFN
• Manufacturer: Microchip Technology

Specifications of MCP23018-E/MJ

• Package / Case: 24-QFN
• Interface: I²C
• Number Of I /o: 16
• Interrupt Output: Yes
• Frequency - Clock: 3.4MHz
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Logic Family: MCP23018
• Propagation Delay Time: 50 ns
• Operating Supply Voltage: 1.8 V to 5.5 V
• Power Dissipation: 700 mW
• Operating Temperature Range: - 40 C to + 125 C
• Input Voltage: 1.8 V to 5.5 V
• Logic Type: I/O Expander
• Maximum Clock Frequency: 10 MHz
• Maximum Operating Frequency: 3.4 MHz
• Mounting Style: SMD/SMT
• Output Current: 25 mA
• Output Voltage: 1.8 V to 4.5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

MCP23018/MCP23S18
1.4
The ADDR pin is used to set the slave address of the
MCP23018 (I
the bus using only a single pin. Typically, this would
require three pins.
The multi-bit Address Decoder employs a basic FLASH
ADC architecture
generate 8 unique values based on the analog input.
This value is converted to a 3-bit code which corre-
sponds to the address bits (A2, A1, A0) in the serial
OPCODE.
Sequence
timings):
1.
FIGURE 1-2:
DS22103A-page 10
Upon power up (after V
becomes active after time t
log value on the ADDR pin must be stable
before this point to ensure accurate address
assignment.
Multi-bit Address Decoder
of
2
C only) to allow up to eight devices on
R1
R2
(Figure
V2
Operation
V
DD
VOLTAGE DIVIDER EXAMPLE
V
1-4). The seven comparators
SS
DD
ADDR
stabilizes) the module
(see
ADEN
. Note, the ana-
Figure 1-5
V
V
SS
DD
for
2.
3.
Once the address bits are latched, the device will keep
the slave address until a POR or reset condition
occurs.
1.4.1
When calculating the required voltage on the ADDR pin
(V2), the set point should be the mid-point of the LSb of
the ADC.
The examples in
to determine the mid point voltage (V2) and the range
of voltages based on a voltage divider circuit. The
maximum tolerance is 20%, however, it is recom-
mended to use 5% tolerance worst case (10% total tol-
erance).
MCP23018
The 3-bit address is latched after t
The module powers down after the first rising
edge of the serial clock is detected (t
CALCULATING VOLTAGE ON ADDR
Figure 1-2
© 2008 Microchip Technology Inc.
and
A0
A1
A2
Figure 1-3
ADDRLAT .
ADDIS
show how
).