A1185LLHLT 查看數據表（PDF） - Allegro MicroSystems

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A1185LLHLT

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

Enabling Addressing Mode. The first segment of code is a

keying sequence used to enable the bitfield addressing mode. As

shown in figure 7, this segment consists of one short VPH pulse,

one VPM pulse, and one short VPH pulse, with no supply inter-

ruptions. This sequence is designed to prevent the device from

being programmed accidentally, such as by noise on the supply

line.

V+

VPH

VPM

VPL

0

t

Figure 7. Addressing mode enable pulse sequence

Address Selection. After addressing mode is enabled, the

target bitfield address, is indicated by a series of VPM pulses, as

shown in figure 8.

V+

VPH

VPM

VPL

0

Address 1

Address 2

Address n ( ≤ 127)

t

Figure 8. Pulse sequence to select addresses

Lock Bit Programming. After the desired BOP calibration value

is programmed, and all of the corresponding bitfield-level fuses

are blown, the device-level fuse should be blown. To do so, the

lock bit (bitfield address 32) should be encoded as 1 and have

its fuse blown. This is done in the same manner as permanently

setting the other bitfields, as shown in figure 9.

V+

VPH

Falling edge of final BOP address digit

VPM

VPL

128 pulses

0

Enable

Address

Blow

Encode Lock Bit

t

Figure 9. Pulse sequence to encode lock bit

Allegro MicroSystems, Inc.

12

115 Northeast Cutoff, Box 15036

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

www.allegromicro.com

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