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CS5460 Datasheet(PDF) 31 Page - Cirrus Logic |
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CS5460 Datasheet(HTML) 31 Page - Cirrus Logic |
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31 / 34 page  CS5460 DS279PP5 31 6. PIN DESCRIPTION 1 2 3 4 5 6 7 817 18 19 20 21 22 23 24 9 10 11 12 13 14 15 16 Crystal Out XOUT CPU Clock Output CPUCLK Positive Digital Supply VD+ Digital Ground DGND Serial Clock Input SCLK Serial Data Output SDO Chip Select CS No Connect NC Differential Voltage Input VIN+ Differential Voltage Input VIN- Voltage Reference Output VREFOUT Voltage Reference Input VREFIN XIN Crystal In SDI Serial Data Input EDIR Energy Direction Indicator EOUT Energy Output INT Interrupt RESET Reset NC No Connect PFMON Power Fail Monitor IIN+ Differential Current Input IIN- Differential Current Input VA+ Positive Analog Supply VA- Analog Ground Clock Generator Crystal Out Crystal In 1,24 XOUT, XIN - A gate inside the chip is connected to these pins and can be used with a crystal to provide the system clock for the device. Alternatively, an external (CMOS compatible clock) can be supplied into XIN pin to provide the system clock for the device. CPU Clock Output 2 CPUCLK - Output of on-chip oscillator which can drive one standard CMOS load. Control Pins and Serial Data I/O SCLK 5 Serial Clock Input - A clock signal on this pin determines the input and output rate of the data for the SDI and SDO pins respectively. This input is a Schmitt trigger to allow for slow rise time signals. The SCLK pin will recognize clocks only when CS is low. SDO 6 Serial Data Output - SDO is the output pin of the serial data port. Its output will be in a high impedance state when CS is high. CS 7 Chip Select - When active low, the port will recognize SCLK. An active high on this pins puts the SDO pin in a high impedance state. CS should be changed when SCLK is low. INT 20 Interrupt - When INT goes low it signals that an enabled event has occurred. INT is cleared (logic 1) by writing the appropriate command to the CS5460. EOUT 21 Energy Output - The energy output pin output a fixed-width pulse rate output with a rate (programmable) proportional to energy. EDIR 22 The energy direction indicator indicates if the measured energy is negative. SDI 23 Energy Direction Indicator - Serial Data Input - SDI is the input pin of the serial data port. Data will be input at a rate determined by SCLK. Measurement and Reference Input Differential Voltage Inputs 9,10 VIN+, VIN- - Differential analog input pins for voltage channel. Voltage Reference Output 11 VREFOUT - The on-chip voltage reference is output from this pin. The voltage reference has a nominal magnitude of 2.5 V and is reference to the VA- pin on the converter. Voltage Reference Input 12 VREFIN - The voltage input to this pin establishes the voltage reference for the on-chip modulator. |
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