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UZZ9001 데이터시트(PDF) 8 Page - NXP Semiconductors |
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UZZ9001 데이터시트(HTML) 8 Page - NXP Semiconductors |
8 / 16 page 2000 Nov 27 8 Philips Semiconductors Product specification Sensor Conditioning Electronic UZZ9001 Magnet lost condition If both offset corrected input signal of sensor 1 and sensor 2 are below the lost magnet threshold then the failure ‘Magnet lost’ is assumed. Offset trimming To achieve a linear output characteristic, it is necessary to shift the offsets of the two input signals to the input stage of the UZZ9001. For this reason a sensor offset cancellation procedure has been implemented in the UZZ9001 which is started by sending a special serial data protocol to the UZZ9001. This trimming procedure is required for both input signals. Trim interface The UZZ9001 trim mode serial interface consists of the two terminals SMODE (pin 10) and DATA_CLK (pin 9). The structure of this protocol is shown in Figure 5. All signal levels of DATA_CLK and SMODE must lie within the ranges set out in Table 3. The protocol starts with a falling edge at the SMODE, which must occur at a high DATA_CLK level. The following five bits are used to code the message sent to the UZZ9001. They are transferred via the SMODE and are sampled with the rising edge of the DATA_CLK. During the fifth high level output of DATA_CLK (counted from the start condition onwards), a rising edge must appear at the SMODE and the DATA_CLK follows this with one more change to low level in order to successfully complete the protocol. Table 3 Definition of the trim interface signals PARAMETER MIN. MAX. UNIT low level of DATA_CLK, SMODE 0 5 %VDD high level of DATA_CLK, SMODE 95 100 %VDD rise and fall time of DATA_CLK and SMODE signal edges (10 to 90% VDD) and (90 to 10% VDD) 8 − ns DATA_CLK frequency 0.1 1 MHz handbook, full pagewidth MHB702 DATA_CLK (input at pin 9) SMODE (input at pin 10) TOUT (output at pin 22) 1 2345 stop condition statusbit # start condition T1 T0 Fig.5 Protocol used to set UZZ9001 into trim mode. |
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