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CS2082EDW20 데이터시트(PDF) 7 Page - ON Semiconductor |
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CS2082EDW20 데이터시트(HTML) 7 Page - ON Semiconductor |
7 / 12 page CS2082 http://onsemi.com 7 Each SHx pin is pulled up to VBAT while each SLx pin is pulled down to GND through separate nominal 10 k Ω resistors, thus biasing each normal fire path to about 1/2 VBAT. An open fire path has been detected if both the SBx and SGx bits are set for that path. To detect faults between fire paths and to test driver function, each driver should be activated individually. The activated driver should cause its respective fault bit to be set. If an activated driver does not set its respective fault bit, a driver fault has been detected. If an activated driver causes the fault bit of an inactivated driver to be set, a fault between fire paths has been detected. Table 4 defines the implied ranges over which the various types of faults can be detected. Table 4. Implied Resistive Fault Detection Ranges Fault Min Nom Max Unit Short to Ground 1 5 10 k Ω Short to Battery 1 5 10 k Ω Open 5 20 40 k Ω Driver Open 1 5 10 k Ω Driver Shorted 1 5 10 k Ω Squib to Squib 1 5 10 k Ω Squib Resistance Measurement – $3d The $3d command activates squib resistance measurement for the selected firing path. The respective active–high bit definitions are shown in Table 5. At power–up, the default path is ‘None.’ Table 5. Squib Resistance Path Select D3 D2 D1 D0 Path x x 0 0 NONE x x 0 1 SQUIB 1 x x 1 0 SQUIB 2 x x 1 1 NONE Squib resistance is measured by forcing 50 mV nominal (proportional to VCC) across the squib. The resulting squib current is passed to an external load resistor at the MR pin, converting the current back into a voltage. This voltage may be read directly at the MR pin, or passed through the analog multiplexer to be read at the AOUT pin. The known values of the squib differential voltage (VDIFF) and the MR resistance (RMR), and the measured MR voltage (VMR) indicate squib resistance such that: RSQUIB + RMR VDIFF VMR Typical MR voltage response for RMR = 50 Ω over a squib resistance range of 0.6 Ω to 6.0 Ω is illustrated in Figure 2. Figure 2. Typical MR Voltage Response 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0.6 1.4 2.2 3.0 3.8 4.6 5.4 RSQUIB Measurement accuracy of the CS2082 with combined tolerances and with and external 1% load resistor at the MR pin can be defined by the equation: RSQ(E) + VDIFF(IDEAL) RMR(IDEAL) VDIFF"12% RSQ(A) " 1% RMR " 1% + RSQ(A))12.5% *15.94% where VDIFF(IDEAL) and RMR(IDEAL) are the assumed values for the squib resistance solution algorithm, RSQ(A) is the actual squib resistance, and RSQ(E) is the result of the solution algorithm. An additional error may be added if the MR voltage is measured through the analog multiplexer. In operation, current is sourced from VBAT to the SHx pin, through the squib to the SLx pin, and returned to ground through the MR load resistor. Current clamps are provided for both the SHx and SLx pins and a voltage clamp is provided for the MR pin. These clamps along with the resolution of the ADC are the constraining factors for the minimum and maximum measurable squib resistance values. The minimum measurable squib resistance can be defined as: VDIFF(MIN) ILIM(MAX) v RSQUIB(MIN) v VDIFF(MIN) RMR(MIN) VCLAMP(MAX) The maximum measurable squib resistance can be defined as: RSQUIB(MAX) + VDIFF(MAX) RMR(MAX) (2n * 1) VCC(MIN) In the above equations, VDIFF is the SHx–SLx forced differential voltage, ILIM is the SHx resistive measure current limit, VCLAMP is the MR clamp voltage, RMR is the toleranced MR load resistor value and n is the number of bits of resolution of the ADC. It should be noted that during resistive measurements, faults to GND or BAT (dependent on VBAT voltage and |
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