MAX7315 Ver la hoja de datos (PDF) - Maxim Integrated
Número de pieza
componentes Descripción
Fabricante
MAX7315
Maxim Integrated
MAX7315 Datasheet PDF : 26 Pages
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8-Port I/O Expander with LED Intensity
Control, Interrupt, and Hot-Insertion Protection
PIN
QSOP/TSSOP
QFN
1, 2, 3
15, 16, 1
4–7, 9–12
8
2–5, 7–10
6
13
11
14
12
15
13
16
14
—
PAD
Pin Description
NAME
FUNCTION
AD0, AD1, Address Inputs. Sets device slave address. Connect to either GND, V+,
AD2
SCL, or SDA to give 64 logic combinations. See Table 1.
P0–P7 Input/Output Ports. P0–P7 are open-drain I/Os rated at 5.5V, 50mA.
GND
Ground. Do not sink more than 190mA into the GND pin.
INT/O8
SCL
Output Port. Open-drain output rated at 7.0V, 50mA. Configurable as
interrupt output or general-purpose output.
I2C-Compatible Serial Clock Input
SDA
I2C-Compatible Serial Data I/O
Positive Supply Voltage. Bypass V+ to GND with a 0.047µF ceramic
V+
capacitor
Exposed pad Exposed Pad on Package Underside. Connect to GND.
DATA FROM
SHIFT REGISTER
DATA FROM
SHIFT REGISTER
WRITE
CONFIGURATION
PULSE
CONFIGURATION
REGISTER
DQ
FF
CK Q
OUTPUT
PORT
REGISTER
DQ
FF
WRITE PULSE
CK Q
READ PULSE
Figure 1. Simplified Schematic of I/O Ports
INPUT PORT
REGISTER
DQ
FF
CK Q
OUTPUT PORT
REGISTER DATA
I/O PIN
Q2
GND
INPUT PORT
REGISTER DATA
TO INT
Functional Overview
The MAX7315 is a general-purpose input/output (GPIO)
peripheral that provides eight I/O ports, P0–P7, con-
trolled through an I2C-compatible serial interface. A 9th
output-only port, INT/O8, can be configured as an inter-
rupt output or as a general-purpose output port. All out-
put ports sink loads up to 50mA connected to external
supplies up to 5.5V, independent of the MAX7315’s
supply voltage. The MAX7315 is rated for a ground cur-
rent of 190mA, allowing all nine outputs to sink 20mA at
the same time. Figure 1 shows the output structure of
the MAX7315. The ports default to inputs on power-up.
Port Inputs and Transition Detection
An input ports register reflects the incoming logic levels
of the port pins, regardless of whether the pin is
defined as an input or an output. Reading the input
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