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LC709004A Datenblatt(PDF) 10 Page - ON Semiconductor |
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LC709004A Datenblatt(HTML) 10 Page - ON Semiconductor |
10 / 13 page 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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Ähnliche Beschreibung - LC709004A |
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