HAL710 datasheet(18/19 Pages) MICRONAS

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HAL 710, HAL 730

DATA SHEET

Oct. 13, 2009; DSH000031_002EN

Micronas

5.5. EMC and ESD

For applications that cause disturbances on the supply

line or radiated disturbances, a series resistor and a

capacitor are recommended (see Fig. 5–1). The series

resistor and the capacitor should be placed as closely

as possible to the Hall sensor.

Please contact Micronas for detailed investigation

reports with EMC and ESD results.

Fig. 5–1: Test circuit for EMC investigations

5.6. Start-up Behavior

Due to the active offset compensation, the sensors

have an initialization time (enable time ten(O)) after

applying the supply voltage. The parameter ten(O) is

specified in the “Characteristics” (see Section 3.6. on

page 11).

During the initialization time, the output states are not

defined and the outputs can toggle. After ten(O), both

outputs will be either high or low for a stable magnetic

field (no toggling) and the Count Output will be low if

the applied magnetic field B exceeds BON. The Count

Output will be high if B drops below BOFF. The Direc-

tion Output will have the correct state after the second

edge (rising or falling) in the same direction.

The device contains a Power-On Reset circuit (POR)

generating a reset when VDD rises. This signal is used

to disable Test Mode. The generation of this reset sig-

nal is guaranteed when VDD at the chip rises to a mini-

mum 3.8 V in less than 4 µs monotonically. If this con-

dition is violated, the internal reset signal might be

missing. Under these circumstances, the chip will still

operate according to the specification, but the risk of

toggling outputs during ten(O) increases; and for mag-

netic fields between BOFF and BON, the output states

of the Hall sensor after applying VDD will be either low

or high. In order to achieve a well-defined output state,

the applied magnetic field then must exceed BONmax,

respectively, drop below BOFFmin.

1 VDD

4GND

3 S1-Output

2 S2-Output

220

VEMC

4.7 nF

2.4 k

20 pF

2.4 k

20 pF

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