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LC709004A Arkusz danych(PDF) 10 Page - ON Semiconductor

Numer części LC709004A
Szczegółowy opis  I/O-Expander for Microcontroller
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Producent  ONSEMI [ON Semiconductor]
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LC709004A Arkusz danych(HTML) 10 Page - ON Semiconductor

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LC709004A
No.A0165-10/13
Application Examples
(1) Example of a cascade configuration
Two or more LC709004A LSI chips can be cascaded to realize port expansion beyond 16 bits. Port expansion,
however, need to be made in units of 16 bits
× n (n denotes the number of LSI chips).
Fig. 5
(2) Variable port power level example
When controlling the level of I/O ports according to the power voltage level of the peripheral equipment, the user
can connect the output from the power supply of the peripheral equipment directly to the power supply pins for the
I/O ports. The LC709004A dispenses with the need to add an external level shifter circuit.
Note the following when configuring the LC709004A in this way:
Note 5:
• VDDP1: The voltage level of VDDP1 must not be higher than that of VDD (VDDP1≤VDD).
• The input level of all ports (P00 to P17) is dependent on the VDD power source; it depends on none of the power
sources VDDP1.
* Be sure to check the electrical characteristics of the LC709004A.
Fig. 6
System Reset (RES)
Serial CS Output (CS)
Serial Data Output (SDO)
Serial Clock Output (SCK)
Serial Data Input (SDI)
Microcontroller (MCU)
RES
CS
DIN
CLK
DOUT
LC709004
RES
CS
DIN
CLK
DOUT
LC709004
RES
CS
DIN
CLK
DOUT
LC709004
System Reset
(LSI=1)
(LSI=2)
(LSI=n)
Microcontroller (MCU)
LC709004A
5.0V
5.0V selial
send/receive
5.0V parallel data I/O
3.3V parallel data I/O
Nch-open drain display
data output
5.0V peripheral
3.3V peripheral
LED display
5.0V
3.3V
3.3V
VDD
VSS
VDDP1
P00 to P07
P10 to P13
P14 to P17
RES, CE,
CLK, DIN, DOUT
VDD
VSS


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