Rainbow-electronics MAX7313 Manual do Utilizador Página 6

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MAX7313
Functional Overview
The MAX7313 is a general-purpose input/output (GPIO)
peripheral that provides 16 I/O ports, P0P15, con-
trolled through an I
2
C-compatible serial interface. A
17th output-only port, INT/O16, can be configured as
an interrupt output or as a general-purpose output port.
All output ports sink loads up to 50mA connected to
external supplies up to 5.5V, independent of the
MAX7313s supply voltage. The MAX7313 is rated for a
ground current of 350mA, allowing all 17 outputs to sink
20mA at the same time. Figure 1 shows the output
structure of the MAX7313. The ports default to inputs on
power-up.
Port Inputs and Transition Detection
Input ports registers reflect the incoming logic levels of
the port pins, regardless of whether the pin is defined
16-Port I/O Expander with LED Intensity
Control and Interrupt
6 _______________________________________________________________________________________
Pin Description
Figure 1. Simplified Schematic of I/O Ports
D
C
K
Q
Q
FF
DATA FROM
SHIFT REGISTER
DATA FROM
SHIFT REGISTER
WRITE
CONFIGURATION
PULSE
WRITE PULSE
READ PULSE
CONFIGURATION
REGISTER
D
C
K
Q
Q
FF
INPUT PORT
REGISTER
D
C
K
Q
Q
FF
OUTPUT
PORT
REGISTER
OUTPUT PORT
REGISTER DATA
I/O PIN
Q2
GND
INPUT PORT
REGISTER DATA
TO INT
PIN
QSOP QFN
NAME FUNCTION
122INT/O16
Output Port. Open-drain output rated at 7V, 50mA. Configurable as interrupt
output or general-purpose output.
21, 2, 3 18, 23, 24
AD0, AD1,
AD2
Address Inputs. Sets device slave address. Connect to either GND, V+,
SCL, or SDA to give 64 logic combinations. See Table 1.
411, 1320 18, 1017 P0P15 Input/Output Ports. P0P15 are open-drain I/Os rated at 5.5V, 50mA.
12 9 GND Ground. Do not sink more than 350mA into the GND pin.
22 19 SCL I
2
C-Compatible Serial Clock Input
23 20 SDA I
2
C-Compatible Serial Data I/O
24 21 V+
Positive Supply Voltage. Bypass V+ to GND with a 0.047µF ceramic
capacitor.
PAD EXPOSED PAD Exposed pad on package underside. Connect to GND.
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