SL353

Micropower Omnipolar Digital Hall-Effect Sensor ICs DESCRIPTION The SL353 Series sensor ICs (Integrated Circuits) are small, versatile, digital Hall-effect devices operated by the magnetic field from a permanent magnet or an electromagnet. These sensitive devices are designed to meet a wide range of potential applications with low power requirements. The SL353 Series responds to either a North or South pole, meaning that they do not require the magnet polarity to be identified, providing an easier installation and potentially reducing system cost. These low-power sensing devices use BiCMOS (Bipolar Complementary Metal Oxide Semiconductor) technology and a timing circuit that turns the power on for only a short time it is off for the rest of the period (duty cycle) significantly reducing the average current consumption. Both products can operate from a supply voltage as low as 2.2 V, promoting energy efficiency. The push-pull output does not require a pull-up resistor and can operate with very low current levels, potentially helping to reduce cost and minimizing the total current consumption. The SL353 Series is available in two duty cycle configurations to accommodate a variety of application needs : SL353HT: High duty cycle (13% typ.) for applications requiring high switching speed and a lower current (0.33 mA typ.) than standard Hall-effect sensor ICs. SL353LT: Very low duty cycle (0.013% typ.), resulting in extended battery life in applications requiring extremely low current drain (1.8 µA typ.) and not requiring a high switching speed. The SL353 Series has a typical operating point of ±60 Gauss at 25 °C [77 °F]. These sensors are available in the subminiature SOT-23 surface mount package on tape and reel (3000 units per reel), for use in automated pick-and-place component installation. VALUE PROPOSITIONS SL353LT For device manufacturers who need ultra low power sensing for battery-operated, mobile applications, Honeywell’s SL353LT Omnipolar Hall-Effect Sensor IC provides an ultra low power (1.8 μA, 2.8 Vdc) sensor IC and helps minimize PCB (Printed Circuit Board) space, part count and cost for the entire application. Unlike other low power Hall-effect sensors, the SL353LT offers ultra low power sensing with significantly lower noise emissions and the ability to minimize PCB space and cost for the entire application as demonstrated by a non-chopper stabilized design, subminiature SOT-23 packaging, omnipolar sensing, the shortest active mode time and lowest average current in its class. SL353HT For device manufacturers who need to optimize the PC board in energy efficient, “green” products with higher switching frequency requirements, Honeywell’s SL353HT Omnipolar Hall-Effect Sensor IC provides a low power sensor IC that can be used in higher switching frequency applications. Unlike standard Hall-Effect sensors, the SL353HT offers the ability to optimize the PCB in high switching frequency applications as demonstrated by its low power (0.33 mA, 2.8 Vdc) use, high duty cycle (13% typ.) and subminiature SOT-23 package size. FEATURES AND BENEFITS ( = competitive differentiator)  Energy efficient: Supply voltage as low as 2.2 Vdc, combined with very low average current (1.8 µA typ. for SL353LT the lowest in its class), reduces power consumption, provides extended battery life, and promotes energy efficiency  Push-pull output does not require external pull-up resistor: Simplifies interface with common electrical circuits and potentially reduces PC board space and costs to the customer  Non-chopper stabilized design: Does not utilize chopper stabilization, eliminating the noise generated by products using this technique. This means that customers do not need filters to compensate for the noise, helping to reduce PC board space, part counts, and costs for the application Versatile: Omnipolar capability with high and low duty cycle options allows for use in a variety of potential applications with low power requirements and/or battery operation, including motion control, lid closure detection, presence-absence, metering, and displacement sensing Stable: Thermally balanced integrated circuit provides for stable operation over a wide temperature range, from -40° to 85 °C [-40° to 185 °F] Subminiature size: The SOT-23 subminiature package size requires less PCB space, allowing for use in smaller assemblies Price competitive: By using BiCMOS technology, Honeywell has been able to design a reduced size integrated circuit, saving on manufacturing costs while still meeting customer requirements; these savings can result in lower costs to customers Helps reduce total system cost: Because they can be operated by a North pole or a South pole, they do not require the magnet polarity to be identified, thus making the installation easier and potentially reducing the sys tem cost Reduces manufacturing costs: SL353 Series is supplied on tape and reel, often allowing for automated, lower -cost pick and place assembly which can help the customer reduce manufacturing costs Supplied on tape and reel: Allows for a compact design with automated component placement, helping to reduce manufacturing costs Compliant: RoHS-compliant materials meet Directive 2002/95/EC POTENTIAL APPLICATIONS Battery-operated, mobile equipment such as: Door or lid closure detection in computer notebooks, scanners, hand-held industrial computers and instrumentation Mobile printer head position sensing Small, hand-held medical and dental equipment Trigger switch for battery-operated hand tools (i.e., drills, drivers) Reed switch replacement in battery operated security systems Magnetic encoder for building access (array) Power switch or open-close detection in small batteryoperated appliances (i.e., vacuum cleaners, fans) Gas or water consumption measurement in remote, battery-operated utility meters 2 www.honeywell.com/sensing Table 1. SL353 Series Specifications1 Characteristic Supply voltage (Vs) Active mode current Sleep mode current Average current: SL353HT SL353HT SL353LT SL353LT Active mode time Condition Ta = -40 C to 85 C Vs = 2.8 V, Ta = 25 °C Vs = 2.2 V to 5.5 V, Ta = -40 C to 85 C Vs = 2.8 V, Ta = 25 °C Vs = 2.2 V to 5.5 V, Ta = -40 C to 85 C Vs = 2.8 V, Ta = 25 °C Vs = 2.2 V to 5.5 V, Ta = -40 C to 85 C Vs = 2.8 V, Ta = 25 °C Vs = 2.2 V to 5.5 V, Ta = -40 C to 85 C Vs = 2.8 V, Ta = 25 °C Vs = 2.2 V to 5.5 V, Ta = -40 C to 85 C Min. 2.2 Typ. 2.8 2.5 2.5 1.5 1.5 0.33 0.33 1.8 1.8 6 6 Max. 5.5 4 9 2.5 8 0.64 2.3 3 9 9 30 Unit V mA μA mA mA μA μA μs 3 3 Period: SL353HT Vs = 2.8 V, Ta = 25 °C 30 45 80 μs SL353HT Vs = 2.2 V to 5.5 V, Ta = -40 C to 85 C 20 45 150 μs SL353LT Vs = 2.8 V, Ta = 25 °C 30 45 80 ms SLS353LT Vs = 2.2 V to 5.5 V, Ta = -40 C to 85 C 20 45 150 ms Duty cycle: SL353HT Vs = 2.8 V, Ta = 25 °C 10 13 16 SL353HT Vs = 2.2 V to 5.5 V, Ta = -40 C to 85 C 5 13 25 % SL353LT Vs = 2.8 V, Ta = 25 °C 0.01 0.013 0.016 SL353LT Vs = 2.2 V to 5.5 V, Ta = -40 C to 85 C 0.005 0.013 0.025 Vout1: high Vs = 2.8 V, Ta = 25 °C, load current = 100 µA Vs - 0.15 Vs - 0.11 high Vs = 2.2 V to 5.5 V, Ta = -40 C to 85 C, load current = 100 µA Vs - 0.25 Vs - 0.11 V low Vs = 2.8 V, Ta = 25 °C, load current = 100 µA 0.11 0.15 low Vs = 2.2 V to 5.5 V, Ta = -40 C to 85 C, load current = 100 µA 0.11 0.25 Operate point (positive) Vs = 2.2 V to 5.5 V, Ta = -40 C to 85 C 20 60 110 Gauss Operate point (negative) Vs = 2.2 V to 5.5 V, Ta = -40 C to 85 C -110 -60 -20 Gauss Release point (positive) Vs = 2.2 V to 5.5 V, Ta = -40 C to 85 C 5 45 95 Gauss Release point (negative) Vs = 2.2 V to 5.5 V, Ta = -40 C to 85 C -95 -45 -5 Gauss Differential Vs = 2.2 V to 5.5 V, Ta = -40 C to 85 C 3 15 60 Gauss Operating temperature Vs = 2.2 V to 5.5 V, Ta = -40 C to 85 C -40 [-40] 85 [185] °C [°F] Storage temperature -40 [-40] 150 [302] °C [°F] Note 1: These Hall-effect sensors may have an initial output in either the ON or OFF state if powered up with an app lied magnetic field in the differential zone (applied magnetic field > Brp and < Bop). Honeywell recommends that the application circuit de signer allow 10 µs after supply voltage has reached its rated value for the output voltage to stabilize. Table 2. SL353 Series Absolute Maximum Ratings1 Characteristic Condition Min. Typ. Max. Unit Supply voltage -0.5 6 V Operating temperature ambient -40 [-40] 150 [302] C [°F] Soldering temperature applied for