OM1894

Draft Data Sheet INTEGRATED CIRCUIT 2002 Nov 08 OM1894 w Dual w sensing precision triac control thermostat w INTEGRATED ELECTRONIC SOLUTIONS 1BUTLER D RIVE HENDON SA 5014 AUSTRALIA .D t a S a e h t e U 4 .c m o w w w .D at h S a t e e 4U . m o c Integrated Electronic Solutions, Hendon, South Australia Draft Data Sheet Dual sensing precision triac control thermostat CONTENTS 1 2 3 4 4.1 4.2 5 6 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 6.10 6.11 7 8 9 9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.8 9.9 9.10 9.11 9.12 9.13 10 10.1 10.2 10.3 10.4 10.5 10.6 FEATURES GENERAL DESCRIPTION ORDERING INFORMATION PINNING INFORMATION Pinning layout Pin description BLOCK DIAGRAM FUNCTIONAL DESCRIPTION VCC − Common, positive DC supply VEE − Negative DC supply, substrate PWR − Power supply and synchronisation from the mains supply line ext_Reset − Reset status and control CI − triac drive control input MODE − external triac ON/OFF control sense, or internal logic TRG − Triac gate drive PX − triac gate pulse width external setting SA and SB − Sensor inputs CAP − Timing capacitor OP − output of thermostat latches LIMITING VALUES CHARACTERISTICS APPLICATION INFORMATION Design considerations Sensor function Triac drive control input, and mode Gate drive Pulse width extension Power supply requirements Startup reset Operating mode at switch on Zero-crossing detection Inductive loads Sensor circuits Common connection to load, triac, and sensor Important: Electrical safety warning APPLICATION CIRC...