33813 datasheet(30/54 Pages) FREESCALE

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Analog Integrated Circuit Device Data



Freescale Semiconductor

33813

5.1.23 Controls for the VRSN and VRSP Inputs

The VRS can be connected to the 33813 in either a differential or single-ended fashion. The use of differential filtering capacitor,

and grounded capacitors of at least 100 nF are also advisable. In some applications, a damping resistor of approximately

5.0 kOhm directly across the pickup coil is also useful to minimize high frequency ringing.

5.1.24 GND VRSN Bit

To use the VRS inputs in a single-ended configuration the “GND VRSN” bit in the SPI Configuration register must be set to indi-

cate to the 33813 that this mode is being used. The VRS is then connected between the VRSP input and ground. The default for

this bit is zero (0) indicating that the differential mode is selected.

5.1.25 2.5 Volt Reference Disconnect Bit

The disconnect 2.5 Volt reference bit in the SPI VRS configuration register is used to disconnect the internal 2.5 Volt reference

signal from the VRSN and VRSP inputs, so that an external reference voltage can be employed. The default state of this bit is

zero (0), indicating that the internal 2.5 Volt reference voltage is connected to the VRSN and VRSP inputs.

5.1.26 Selecting the Input Threshold and Blanking Time

Two different SPI registers are provided to control the VRS circuit values in the manual mode. The SPI VRS configuration register

is used to set the “engine running” values for the threshold and blanking filter and the SPI VRS control register is used to provide

the “engine cranking “threshold and blanking filter values. Once the engine is running, the MCU clears the SPI VRS control

0100

23 - 55 mV

(Tolerance not specified below 110 mV threshold. Only specified for monotonicity.)

0101 (default)

35 - 75 mV

(Tolerance not specified below 110 mV threshold. Only specified for monotonicity.)

0110

74 mV

(Tolerance not specified below 110 mV threshold. Only specified for monotonicity.)

0111

110 mV - 1.715 V +/- 20%

1000

150 mV +/- 20%

1001

215 mV +/- 20%

1010

300 mV +/- 20%

1011

425 mV +/- 20%

1100

600 mV +/- 20%

1101

850 mV +/- 20%

1110

1.210 V +/- 20%

1111

1.715 V +/- 20%

Table 11. SPI VRS Manual Configuration Register

SPI VRS Manual Parameters Configuration Register

Bits 7, 6, 5, 4

Threshold Values (nominal)

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