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MAX9621AUB+T Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX9621AUB+T Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 14 page Dual, 2-Wire Hall-Effect Sensor Interface with Analog and Digital Outputs 11 Sleep Mode Input (SLEEP) The MAX9621 features an active-low SLEEP input. Pull SLEEP low for more than 40Fs to put the device into sleep mode for power saving. In sleep mode, the DOUT1 and DOUT2 outputs are high impedance and are pulled high by pullup resistors. AOUT1 and AOUT2 are set to zero-output current. Hall Input Restart When an input has been shut down due to a short to ground, cycle SLEEP for 10Fs to 20Fs to restart the input. If the other input is operational it is not affected. The restart happens on the rising edge of SLEEP. Input Current Thresholds and Short to Ground The input current high and low thresholds that determine the logic level of the digital outputs are adjusted by changing the RSET value. When the RSET value changes, the following parameters change as well: IIN_HYS, ISC, tBL, tRAMP, tDEL, fMAX, and PR. IIH, IIL, IIN_HYS, ISC, tRAMP, and fMAX are inversely pro- portional to RSET and decrease as RSET increases. This inverse relationship is linear. For example, a 10% change in (1/RSET) results in a 10% change in current parameters. Conversely, time and delay parameters are linear and directly proportional to RSET, and a 10% change in RSET results in an 10% change in time parameters. The difference between the maximum and minimum threshold current limits is the min/max limit spread, which is greater than the threshold hysteresis. The min/max spread and the hysteresis both change by the same per- centage as the mean of the threshold current limits. The following equation is useful for finding the mean of the threshold current limits given a value of RSET resistance: ( ) 0 1 I I I 0 R m = + < × I is the mean of the threshold current limits, R is the value of the RSET resistance in kΩ, the constant I0 = 0.03717mA, and the constant m = -0.001668 (1/(kΩ x mA)). The following equation is useful for finding the value of RSET resistance given a mean of the threshold current limits: ( ) 0 Y Y m I I 0 1 R Y = + × < = Y0 = 6.2013 x 10-5 units of (1/kΩ) To compute the typical input current thresholds from the mean input current, it is necessary to obtain the hyster- esis. The following equation finds the hysteresis given the mean threshold current, I: H = H0 + k x I (I < 0) where H0 = -0.033463 in mA, and k = -0.08414 in mA/mA. Input current threshold high = I - H/2, input current threshold low = I + H/2. Application Information Use of Digital and Analog Outputs The digital output can be used to provide the FP with an interrupt signal that can represent a Hall sensor change of status. DOUT1 and DOUT2 provide a time domain output filter for robust noise immunity. See Figure 2. The analog output can be connected to an ADC with an appropriate load resistor, and can be used to perform custom diagnostics. Figure 4. Hall Input Reenergized When Open Input Is Reconnected to Hall Sensor 14V VIN_ 8V 5mA/ µs HALL INPUT RECONNECTED TO HALL SENSOR 11.5mA IIN_ 0V 0A TIME TIME VBAT - 500mV VBAT - 25mV |
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