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| preliminary CY30 Sensor Interface Sensor interface for an inductive engine wheel speed single rotation sensor FEATURES * * * * * * * differential input single channel two basic thresholds amplitude-dependent part k-tracking with two possible adjustable factors switching at negative zero crossing Glitch filtered open drain output Package : SOIC8 GENERAL DESCRIPTION The integrated circuit CY30 contains an evaluation circuit for potential-free input signals of an inductive sensor. The circuit evaluates the negative zero crossing of the sensor signal. PIN DESCRIPTION Pin 1 2 3 4 5 6 7 8 Name VDD5 DGP DGN GND NBM CONF_K CONF_TH AMP Function 5 V Supply voltage Positive input inductive sensor signal Negative input inductive sensor signal Ground Open drain output rotation speed signal Configuration pin for amplitude dependent part k factor Configuration pin for basic threshold Pin for amplitude dependent threshold tracking MAXIMUM RATINGS Parameter Supply voltage Voltage resistance, all pins Current DGN, DGP Operating ambiente temperature Thermal resistance ESD HBM, MIL883D 3015 100pF / 1.5k Min 4.5 -0.3 -20 -40 -2 Max 5.5 6 20 125 160 +2 Unit V V mA C K/W kV 1 (c)1/2004 All rights reserved by Robert Bosch GmbH including the right to file industrial property rights Robert Bosch GmbH retains the sole powers of distribution, such as reproduction, copying and distribution. page 1 preliminary DETAILED DESCRIPTION The inductive-sensor signal applied to DGP and DGN is raised by an internal voltage divider to a bias voltage of approximately 2.5 V . An internal clamp structure limits the voltage at DGP / DGN between - 0.7 V and VDD5 + 0.7 V typically. The inductive sensor signal is then fed to the internal comparators. With a positive inductive sensor signal which exceeds the positive threshold, the output signal NBM is set to High ( corresponds to preparing for the negative zero crossing ). The analog glitch filter suppresses short disturbance pulses smaller than 3 s. The NBM signal is reset to low at the negative zero crossing. APPLICATION CIRCUIT VDD5 AMP DGP CONF_TH DGN CONF_K GND NBM VDDx C The resistor network is necessary for sensor adapting. Contact Robert Bosch GmbH Automotive Electronics AE / VKF Sales Components Postfach 1342 D-72703 Reutlingen Germany Phone: +49 (0) 7121 / 35-2179 E-Mail: bosch.semiconductors@de.bosch.com Datasheet_CY30.doc Rev. 3 2 (c)1/2004 All rights reserved by Robert Bosch GmbH including the right to file industrial property rights Robert Bosch GmbH retains the sole powers of distribution, such as reproduction, copying and distribution. page 2 |
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