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CDB5461 Datasheet(PDF) 5 Page - Cirrus Logic |
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CDB5461 Datasheet(HTML) 5 Page - Cirrus Logic |
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5 / 27 page  CDB5461 5 1.2.2 Digital Section The schematics for the digital section are shown in Figure 10 on page 22. The digital section contains the microcontroller, test switches, a Maxim MAX3232 interface chip, 32K bytes of SRAM, and one serial EEPROM. The test switches aid in debugging communi- cation problems between the CDB5461 and the PC. The microcontroller derives its clock from a 20.0 MHz crystal. From this, The RS- 232 data conversion IC (10) is configured to communicate via RS-232 at 9600 baud, no parity, 8-bit data, and 1 stop bit. 1.2.3 Power Supply Section Figure 11 on page 23 illustrates the power supply connections to the evaluation board. The VA+ post supplies the positive analog section of the evaluation board, the LT1019, and the ADC. The VA- post supplies the nega- tive analog voltage circuitry. This terminal is grounded when powering the CDB5461 from a single +5 Volt analog supply. The VD+ post supplies the digital section of the ADC and lev- el shifter. The Vu+ post supplies the digital section of the evaluation board, the 8051, the reset circuitry, and the RS-232 interface cir- cuitry. The board’s digital section, supplied via Vu+ post, must be +5 Volts only. Table 2 shows the various power connections with the required jumper settings on J12 and J11. 1.3 Using the Evaluation Board The CS5461 contains a programmable gain amplifier (PGA), two ∆Σ modulators, two high rate filters, an on-chip reference, and power calculation engine to compute Energy, VRMS, IRMS, and Instantaneous Power. The PGA sets the input levels of the current channel at either 50 mVRMS or 250 mVRMS (for VREFIN = 2.5 V). The on-chip reference can provide the necessary 2.5 V reference. This output (VRE- FOUT) is used to supply the VREFIN pin with 2.5 V. The ∆Σ modulators and high rate digital filter allow the user to measure instantaneous voltage, current, and power at a output word rate of 4000 Hz when a 4.096 MHz clock source is used. Table 3 on page 6 describes the various head- ers, jumpers and DIP switches on the CDB5461 evaluation board. DIP switch S1 is used to control the 8051. Table 4 on page 7 il- lustrates the various settings of the DIP switch S1. The S1-3 switch should be set to the Power Supplies Power Post Connections Jumpers Analog Digital VA+ VA- GND VD+ Vu+ J12 J11 +5V +5V +5 NC GND +5 NC +5V +3V +5 NC GND +3 +5 Table 2. Power Supply Connections O O VDDD O O VDDD O O D+ O O D+ Vu+ VD+ VD+ VA+ O O GND O O GND VA- A- O O VDDD O O VDDD O O D+ O O D+ Vu+ VD+ VD+ VA+ O O GND O O GND VA- A- |
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