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UZZ9001 Folha de dados(PDF) 7 Page - NXP Semiconductors |
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UZZ9001 Folha de dados(HTML) 7 Page - NXP Semiconductors |
7 / 16 page 2000 Nov 27 7 Philips Semiconductors Product specification Sensor Conditioning Electronic UZZ9001 handbook, full pagewidth DATA CS MHB700 sensor byte 2 sensor byte 1 Fig.3 CS Line timing. Sensor signal coding The sensor signal comprises 14 bits (D13 to D0) as shown in Fig.4. Bits D12 to D0 are used for the coding of the angle while D0 is reserved to indicate error and diagnostic conditions as defined below. The 14 data bits are arranged in 2 Bytes. D13 is the MSB of the sensor signal and D0 is the LSB of the sensor signal. Byte 2, which is sent first, contains data bits D13 to D7 and additionally the parity bit P2 which is included for the recognition of interrupted messages. P2 gives the ODD parity of data bits D13 to D7 and has to be evaluated by the master module.Similarly, Byte 1 comprises data bits D6 to D0 and parity bit P1, which gives the ODD parity of data bits D6 to D0. The internal coding of angle values is as follows: During normal operation, bit D13 is active low. Each increment represents an angle value of: The error and diagnostic conditions are indicated by D13 = 1 (active high). In an error situation the last two bits (D0 and D1) specify the error code (see Table 2). All other bits (D3 to D12) still show the current measurement value, but as the last two bits are lost for measurement representation the resolution is reduced to 11 bit. Table 2 Error and diagnostic cases coding 00 0000 0000 0000B =0°, 180° 01 1111 1111 1111B = D13 DO 2 13 1 – () 180 ° 2 13 ------------ 179.978 ≈ α inc 180 ° 2 13 ------------ = 0.022 ° ≈ D1 D0 CASE MEASUREMENT VALUE RELIABLE 0 0 no valid value presently available due to RESET no 0 1 magnet lost no 1 0 reserved − 1 1 reserved − handbook, full pagewidth MHB701 P2 D13 D12 D11 D10 D9 D8 D7 P1 D6 D5 D4 D3 sensor byte 2 sensor byte 1 D2 D1 D0 MSB LSB Fig.4 Sensor signal coding. |
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