A1186LUA-T【PDF 13/15 页】IC SWITCH HALL EFFECT UNI 3-SIP

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Sheet目录59

9页 10页 11页 12页 [13页]14页 15页

Ultrasensitive Two-Wire Field-Programmable

Chopper-Stabilized Unipolar Hall Effect Switches

A1185 and

A1186

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

V+

Address 1

Address 2

Address n ( d 127)

Figure 8. Pulse sequence to select addresses

Falling edge of final B

address digit

V+

Encode Lock Bit

Enable

Address

Blow

128 pulses

Figure 9. Pulse sequence to encode lock bit

Lock Bit Programming. After the desired B

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.

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 V

pulse,

one V

pulse, and one short V

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.

Figure 7. Addressing mode enable pulse sequence

V+

Address Selection. After addressing mode is enabled, the

target bitfield address, is indicated by a series of V

pulses, as

shown in figure 8.

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