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| EVB90615 Datasheet, PDF (16/30 Pages) Melexis Microelectronic Systems – Infra Red Thermometer | |||
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8.5.2 Request condition
MLX90615
Infra Red Thermometer
SCL
tREQ
SMBus Request
Figure 13: Request (switch to SMBus) condition
If PWM is enabled, the MLX90615âs SMBus Request condition is needed to disable PWM and reconfigure
SDA/PWM pin before starting SMBus communication. Once disabled, PWM can only be enabled by
switching the supply Off-On. The MLX90615âs SMBus request condition requires forcing the SCL pin LOW for
a period longer than the request time (tREQ). The SDA/PWM line value is ignored in this case.
8.5.3 PWM is disabled
If PWM is disabled by means of EEPROM the SDA/PWM pin is directly used for the SMBus communication
after POR.
3901090615
Rev 001
Page 16 of 30
Data Sheet
28/Aug/2008
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