A1185 데이터 시트보기 (PDF) - Allegro MicroSystems

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A1185

Ultrasensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches

Allegro MicroSystems 

A1185 and

A1186

Ultrasensitive Two-Wire Field-Programmable

Chopper-Stabilized Unipolar Hall Effect Switches

The pulse sequences consist of the following groups of pulses:

1. An enable sequence.

2. A bitfield address sequence.

3. When permanently setting the bitfield, a long VPH fuse-blow-

ing pulse. (Note: Blown bit fuses cannot be reset.)

4. When permanently setting the bitfield, the level of VCC must

be allowed to drop to zero between each pulse sequence, in

order to clear all registers. However, when provisionally set-

ting bitfields, VCC must be maintained at VPL between pulse

sequences, in order to maintain the prior bitfield settings while

preparing to set additional bitfields.

Bitfields that are not set are evaluated as zeros. The bitfield-level

fuses for 0 value bitfields are never blown. This prevents inad-

vertently setting the bitfield to 1. Instead, blowing the device-

level fuse protects the 0 bitfields from being accidentally set in

the future.

When provisionally trying the calibration value, one pulse

sequence is used, using decimal values. The sequence for setting

the value 510 is shown in figure 5.

When permanently setting values, the bitfields must be set indi-

vidually, and 510 must be programmed as binary 101. Bit 3 is

set to 1 (0001002, which is 410), then bit 1 is set to 1 (0000012,

which is 110). Bit 2 is ignored, and so remains 0.Two pulse

sequences for permanently setting the calibration value 5 are

shown in figure 6. The final VPH pulse is maintained for a longer

period, enough to blow the corresponding bitfield-level fuse.

V+

VPH

VPM

VPL

0

Enable

Address

Try 510

Optional

Monitoring

Clear

t

Figure 5. Pulse sequence to provisionally try calibration value 5.

V+

VPH

VPM

VPL

Address

0

Enable

Address

Blow

Enable

Blow

Encode 001002 (410)

Encode 000012 (110)

t

Figure 6. Pulse sequence to permanently encode calibration value 5 (101 binary, or

bitfield address 3 and bitfield address 1).

Allegro MicroSystems, Inc.

11

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

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