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File name m66006e.pdf

MITSUBISHI DIGITAL ASSP MITSUBISHI DIGITAL ASSP M66006P/FP M66006P/FP 12-BIT I/O EXPANDER 12-BIT I/O EXPANDER DESCRIPTION The M66006 is a semiconductor integrated circuit which has 12-bit shift register function to execute serial-parallel conversion and parallel-serial conversion. Because a serial-parallel shift register and a parallel-serial shift register are independently built in this IC, it is possible to read serial input data to a shift register while converting parallel data into serial data. Also, parallel data I/O pins can be set to input mode or output mode bit-by-bit. The M66006 can be widely used for I/O port expansion of MCU, serial bus system data communication, etc. FEATURES · Bi-directional serial data communication with MCU · Read of serial data during parallel-serial conversion. · Bit resolution of serial data I/O · Low power dissipation (50µW/package max.) (VCC=5V, Ta =25°C, in quiescing) · Schmitt input (DI, CLK, S, CS) · Open drain output (DO, from D1 to D12) · Parallel data I/O (from D1 to D12) · Wide operating supply voltage range (VCC=2 to 6V) · Wide operating temperature range (Ta =­20 to 75°C) APPLICATION Serial-parallel data conversion, parallel-serial data conversion, serial bus control by MCU. BLOCK DIAGRAM PIN CONFIGURATION (TOP VIEW) DO 1 DI 2 CS 4 VCC Set input 5 20 D1 19 D2 18 D3 17 D4 16 15 14 13 12 11 D5 Parallel data I/O D6 D7 D8 D9 D10 Serial data output Serial data input DO DI CLK CS D1 D2 D3 D4 D5 Clock input CLK 3 Chip select input S 6 GND 7 S D6 D7 Parallel data D12 outputs D11 8 9 10 D12 D11 D8 D9 D10 GND Outline 20P4 20P2N-A VCC 5 Control circuit Clock input CLK 3 Set input S 6 Shift register ! D12 D11 D10 DO Serial 1 DOdata output 20 D1 19 18 D2 D3 D10 D11 D12 D3 D2 D1 VCC CLK S CS DI Chip select input CS 4 Q12 Q11 Q10 D12 D11 D10 Q12 D11 D10 D1 DI 2 Q3 Q2 Q1 D3 D2 D1 Q3 Q2 Q1 11 9 8 7 GND 10 GND Parallel output latch Parallel data I/O Input form VCC DO VCC D1~ D12 Shift register @ Serial data input Output form 1 MITSUBISHI DIGITAL ASSP M66006P/FP 12-BIT I/O EXPANDER FUNCTION The M66006 realizes low power dissipation and high noise immunity by applying silicon CMOS process. Because a 12-bit serial-parallel shift register and a 12-bit parallel-serial shift register are independently built in this IC, it is possible to read serial input data while converting parallel data into serial data. When CS changes from "H" to "L", serial output of 12-bit parallel data and read of serial data from the MCU start. That is, 12-bit parallel data is latched at the falling edge of CS, synchronized with the falling edge of shift clock, and then output to serial output pin DO as serial data. At the same time, serial data from the MCU is read to the internal shift register at the rising edge of shift clock. The shift clock on and after 13th bit is neglected and pin DO is put in the high impedance state w