поискавой системы для электроныых деталей |
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CS4172 датащи(PDF) 5 Page - Cherry Semiconductor Corporation |
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CS4172 датащи(HTML) 5 Page - Cherry Semiconductor Corporation |
5 / 6 page Applications Information: continued 5 To drive the gaugeÕs pointer to a particular angle, the microcontroller sends a 10-bit digital word into the serial port. These 10 bits are divided as shown in Figure 2. However, from a software programmers viewpoint, a 360¡ circle is divided into 1024 equal parts of .35¡ each. Table 1 shows the data associated with the 45¡ divisions of the 360¡ driver. Figure 2. Definition of serial word. Table 1. Nominal output for major gauge (VBB = 14V). The 10 bits are shifted into the deviceÕs shift register MSB first using an SPI compatible scheme. This method is shown in Figure 3. The CS must be high and remain high for SCLK to be enabled. Data on SI is shifted in on the ris- ing edge of the synchronous clock signal. Data in the shift register changes at SO on the falling edge of SCLK. This arrangement allows the cascading of devices. SO is always enabled. Data shifts through without affecting the outputs until CS is brought low. At this time the internal DAC is updated and the outputs change accordingly. Figure 3. Serial data timing diagram. Figure 4. Power-up sequence. 10 Bits VCC CS SI OE ST 10 Bits OUTPUTS ENABLED OUTPUTS ENABLED SO(tpd) SO(Rise, Fall) 10% - 90% SI(Hold) SI(Setup) SCLK SI SO CSHold CS CSSetup Input Code Ideal Nominal VSIN VCOS (Decimal) Degrees Degrees (V) (V) 0 0 0.176 0.032 10.476 128 45 45.176 10.476 10.412 256 90 90.176 10.476 -0.032 384 135 135.176 10.412 -10.476 512 180 180.176 -0.032 -10.476 640 225 225.176 -10.476 -10.412 768 270 270.176 -10.476 0.032 896 315 315.176 -10.476 10.476 1023 359.65 359.826 -0.032 10.476 Major Gauge (360 °) D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D9 Ð D7 select which octant Divides a 45 ° octant into 128 equal parts to achieve a .35 ° resolution Code 0 Ð 12710 MSB LSB Application Diagram ENABLE CS4172 10k SCLK SI COS- COS+ SIN- SIN+ SO OE CS ST VBB VCC Microcontroller Next Driver 360 ° Gauge VBAT VREG CS-8156 5V 12V |
Аналогичный номер детали - CS4172 |
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Аналогичное описание - CS4172 |
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