A19350LUBATN-RBE datasheet(8/14 Pages) ALLEGRO

8 / 14 page

High Accuracy GMR Wheel Speed and Direction Sensor IC

A19350

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

ASIL Safe State Output Protocol

The A19350 sensor IC contains diagnostic circuitry that will

continuously monitor occurrences of failure defects within the IC.

Refer to Figure 11 for the output protocol of the ASIL safe state

after an internal defect has been detected. Error Protocol 1 will

result from faults due to over frequency conditions from the input

signal. Error Protocol 2 will result from hard failures detected

within the A19350 such as a regulator and front end fault.

Note: If a fault exists continuously, the device will stay in perma-

nent safe state. Refer to the A19350 Safety Manual for additional

details on the ASIL Safe State Output Protocol.

Magnetic

Encoder

ICC(HIGH)

ICC(LOW)

ICC(HIGH)

ICC(LOW)

IRESET

tRESET(EP1)

First Direction Output Pulse

Normal

Operation

Error

Protocol 1

Error

Protocol 2

Error

ICC(HIGH)

ICC(LOW)

IRESET

tRESET(EP2)

First Direction Output Pulse

Error

Output edges are triggered by BDIFF transitions through the

switch points. On a crossing, the output pulse of ICC(HIGH) is pres-

ent for tw(FWD) or tw(REV).

The IC is always capable of properly detecting input signals up to

the defined operating frequency. At frequencies beyond the oper-

ational frequencies specifications (refer to Operational Frequency

specifications noted on page 5), the ICC(HIGH) pulse duration will

collide with subsequent pulses.

ICC(LOW)

ICC(HIGH)

tw(FWD)

Figure 10: Output Timing Example

Figure 11: Output Protocol of the -xBx Variant (ASIL Safe State)

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