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UZZ9001 Folha de dados(PDF) 5 Page - NXP Semiconductors |
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UZZ9001 Folha de dados(HTML) 5 Page - NXP Semiconductors |
5 / 16 page 2000 Nov 27 5 Philips Semiconductors Product specification Sensor Conditioning Electronic UZZ9001 handbook, full pagewidth MHB698 ADC1 DECIMATION FILTER ALU SPI CLK data CS DATA-CLK SMODE CONTROL OSCILLATOR +VO1 −VO1 ADC2 RESET UZZ9001 reset DECIMATION FILTER +VO2 −VO2 Fig.1 Block diagram. The following list gives a short description of the relevant block functions: 1. The ADC block contains two Sigma Delta AD converters, sensor offset correction circuitry and the circuitry required for the sensitivity and offset adjustment of the chip output voltage curve. 2. Two digital low pass decimation filters convert the low resolution high speed bit stream coming from the ADC Sigma Delta converters into a low speed digital word. 3. The ALU block derives an angle value from the two digital inputs using the CORDIC algorithm. 4. The SPI converts the output of the ALU block to a SPI compatible 16 bit word. 5. The CONTROL block provides the clock and the control signals for the chip. 6. The RESET block supplies a reset signal during power-up and power-down when the power supply is below a certain value. 7. The Oscillator unit generates the master clock. Serial Peripheral interface (SPI) The UZZ9001 provides an interface to SPI compatible devices, and as a slave node functions in one operational mode only. For Motorola SPI devices, this mode is selected by setting CPHA to 1 and CPOL to 1. In this transfer mode, data bits are sampled by the master using the leading edge of the clock as shown in Figure 2. The falling edge indicates that the next data bit has to be provided by the slave device (shift operation). An advantage of this mode is that the CS input toggles only once between every two sensor data bytes (see Fig.3). Data transmission can be stopped by the user at any time. The leading edge of the CS input initialises the SPI shift register allowing the start of a complete new transmission. If the CS line is held active low during stop of transmission, resumption of transmission can be made without loss of data |
Nº de peça semelhante - UZZ9001 |
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Descrição semelhante - UZZ9001 |
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