LC709006A-E 데이터 시트보기 (PDF) - ON Semiconductor

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LC709006A-E

I/O-Expander for Microcontroller

ON Semiconductor 

LC709006A

Application Examples

(1) Example of a cascade configuration

Two or more LC709006A LSI chips can be cascaded to realize port expansion beyond 24 bits. Port expansion,

however, need to be made in units of 24 bits × n (n denotes the number of LSI chips).

System Reset

VDD

Microcontroller(MCU)

Serial CS Output(CS)

Serial Clock Output(SCK)

Serial Data Output(SDO)

System Reset(RES)

Serial Data Input(SDI)

LC709006

CS

CLK

DIN

DOUT

RES (LSI=1)

LC709006

CS

CLK

DIN

DOUT

RES

(LSI=2)

LC709006

CS

CLK

DIN

DOUT

RES

(LSI=n)

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 LC709006A dispenses with the need to add an external level shifter circuit.

Note the following when configuring the LC709006A in this way:

Note 5:

• VDDP0: The voltage level of VDDP0 must not be higher than that of VDD (VDDP0≤VDD).

• VDDP1: The voltage level of VDDP1 must not be lower than that of VDD (VDDP1≥VDD).

• VDDP2: The voltage level of VDDP2 must not be lower than that of VDD (VDDP2≥VDD).

• The input level of all ports (P00 to P27) is dependent on the VDD power source; it depends on none of the power

sources VDDP0 to VDDP2.

* Be sure to check the electrical characteristics of the LC709006A.

3.3V

VDD

Microcontroller(MCU)

VSS

0.1μF

VDD

VDDP0

RES, CE,

3.3V serial send/receive CLK, DIN, DOUT

P00 to P07

2.5V parallel data I/O

VDDP1

LC709006

P10 to P17

5V parallel data I/O

2.5V

2.5V peripheral

5V

5V peripheral

5V

VDDP2

P20 to P27

Nch-open drain display

data output

LED display

VSS, VSSP0, VSSP2

Fig. 6

No.8265-11/14

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