SSTS SERIES NEW PRODUCT Solid State Temperature Switch CUSTOM POWER MODULES SSTS shown prior to encapsulation and as a finished assembly. DESCRIPTION This is typically placed in the evaporator of an air conditioning unit. The electrical interface consists of +Vin, Ground, and Output. The modules are constructed using hybrid technology on a ceramic substrate. The standard SSTS functionality combines a highly accurate temperature sensor and a switch in a low cost, compact, rugged unit. Temperature is monitored using a thermistor configured with precision matched thick film resistors in a bridge configuration. The module also contains the control and amplifier electronics necessary to drive a relay, used to switch motors or valves to control the temperature in a system. The external load is driven by the SSTS output transistor. The circuit can be tailored for different input voltages, such as 12 Vdc, ideally suited for automotive HVAC applications. The module "trips" at a desired set point, and resets at an upper trip point established by the hysteresis parameter (+1.5°C typical). The SSTS is exclusively available for customer specific applications. The following design parameters need to be specified by the customer: • Lower temperature trip point • Upper temperature trip point • Output drive requirement • "Nose" configuration • Attachment configuration • Socket/connector interface configuration. • Nominal and min./max. supply voltage The module is designed with a "nose" protrusion that extends into the flow path of the medium being measured. ELECTRICAL Parameter Input Voltage Quiescent Current Trip Point Hysteresis Output Saturation Operating Temperature Conditions Min. Typ. Max. Units 9 12 10 16 Nom. -0.5 * ** Nom. +0.5 Vdc mA °C °C V °C Vin = 12V Ic = 150mA -40 0.3 +85 * Trip point available in 0.5°C increments. ** Custom Hysteresis settings are available (1.5°C typical). Specifications subject to change without notice. 7-37 SSTS Series 7 TYPICAL CONFIGURATION 1.14 17.7 1.10 .75 Thermistor 1.1 TYPICAL INTERCONNECT 12 Volts RL 75 (or Relay) V+ GND OUT ORDERING INFORMATION For pricing, technical support and sample requests contact your local BI Technologies representative or customer service at (714) 447-2345, Fax (714) 447-2500 or by email: [email protected] 7-38 SSTS Series