A1185LLHLT-T Allegro Microsystems Inc, A1185LLHLT-T Datasheet
A1185LLHLT-T
Specifications of A1185LLHLT-T
Related parts for A1185LLHLT-T
A1185LLHLT-T Summary of contents
Page 1
Ultrasensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches These devices are in production, however, they have been deemed Pre-End of Life. These products are approaching end of life. Within a minimum of 6 months, these devices will enter their final, Last ...
Page 2
Ultrasensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches Features and Benefits ▪ Chopper stabilization ▫ Low switchpoint drift over operating temperature range ▫ Low sensitivity to stress ▪ Field programmable for optimized switchpoints ▪ On-chip protection ▫ Supply transient protection ▫ ...
Page 3
A1185 and A1186 Chopper-Stabilized Unipolar Hall Effect Switches Description (continued) than the more traditional open-collector output switches. Additionally, the system designer gains inherent diagnostics because output current normally flows in either of two narrowly-specified ranges. This provides distinct current ranges ...
Page 4
A1185 and A1186 Chopper-Stabilized Unipolar Hall Effect Switches ELECTRICAL CHARACTERISTICS Characteristic Symbol Supply Voltage 1 Supply Current 2 Supply Zener Clamp Voltage V 3 Supply Zener Clamp Current I Reverse Supply Current 4 Output Slew Rate Chopping Frequency 5 Power-On ...
Page 5
A1185 and A1186 Chopper-Stabilized Unipolar Hall Effect Switches I versus Ambient Temperature CC(L) at Various Levels of V (A1185 and A1186 - 100 Ambient Temperature Set by Specific Programming Bit ...
Page 6
A1185 and A1186 Chopper-Stabilized Unipolar Hall Effect Switches THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information Characteristic Package Thermal Resistance *Additional thermal information available on Allegro Web site. Ultrasensitive Two-Wire Field-Programmable Symbol Test Conditions* Package LH, 1-layer ...
Page 7
A1185 and A1186 Chopper-Stabilized Unipolar Hall Effect Switches Operation The output the A1185 switches low after the magnetic CC field at the Hall element exceeds the operate point threshold When the magnetic field is reduced ...
Page 8
A1185 and A1186 Chopper-Stabilized Unipolar Hall Effect Switches Chopper Stabilization Technique A limiting factor for switchpoint accuracy when using Hall effect technology is the small signal voltage developed across the Hall element. This voltage is proportionally small relative to the ...
Page 9
A1185 and A1186 Chopper-Stabilized Unipolar Hall Effect Switches For additional general application information, visit the Allegro Web site at www. allegromicro.com. Typical Application and Programming Circuit The A118x family of devices MUST be protected by an exter- nal bypass capacitor, ...
Page 10
A1185 and A1186 Chopper-Stabilized Unipolar Hall Effect Switches Power Derating The device must be operated below the maximum junction temperature of the device Under certain combinations of J(max) peak conditions, reliable operation may require derating sup- plied power ...
Page 11
A1185 and A1186 Chopper-Stabilized Unipolar Hall Effect Switches Programming Protocol The operate switchpoint can be field-programmed so, a coded series of voltage pulses through the VCC pin is used to set bitfields in onboard registers. ...
Page 12
A1185 and A1186 Chopper-Stabilized Unipolar Hall Effect Switches The pulse sequences consist of the following groups of pulses enable sequence bitfield address sequence. 3. When permanently setting the bitfield, a long V ing pulse. (Note: Blown ...
Page 13
A1185 and A1186 Chopper-Stabilized Unipolar Hall Effect Switches The first segment of code is a Enabling Addressing Mode. keying sequence used to enable the bitfield addressing mode. As shown in figure 7, this segment consists of one short V one ...
Page 14
A1185 and A1186 Chopper-Stabilized Unipolar Hall Effect Switches +0.12 2.98 –0.08 1.49 3 +0.10 2.90 –0. 10° REF 0.95 BSC For Reference Only; not for tooling use (reference dwg. 802840) Dimensions in millimeters Dimensions exclusive of mold flash, ...
Page 15
A1185 and A1186 Chopper-Stabilized Unipolar Hall Effect Switches +0.08 4.09 –0.05 45° +0.08 3.02 –0.05 2.16 MAX 0.51 REF 1 2 15.75 ±0.51 +0.05 0.43 –0.07 Copyright ©2004-2010, Allegro MicroSystems, Inc. Allegro MicroSystems, Inc. reserves the right to make, from ...