MLX90615

More documents

Recommendations

Info

MLX90615Infra Red Thermometer8.4.5 Bit transferSamplingdataChangingdataSCLPWM/SDAFigure 9: Bit transfer on SMBusThe data on SDA must be changed when SCL is low (min 300ns after the falling edge of SCL). The data isfetched by both MD and SDs on the rising edge of the SCL.8.4.6 CommandsIn application mode RAM and EEPROM can be read both with 16x16 sizes. (For example, T OBJ - RAMaddress 0x07h will sweep between 0x2D8Ah to 0x4BD0h as the object temperature rises from -40°C to+115°C). The MSB read from RAM is an error flag (active high) for the linearized temperatures (T OBJ and T a ).Opcode Command0001 aaaa* EEPROM Access0010 aaaa* RAM Access1100_0110 Enter SLEEP modeNote*: The aaaa are the 4 LSBits of the memory map address to be read/written.8.4.7 Sleep ModeSleep mode is available in SMBus mode only.MLX90615 can enter Sleep Mode via command “Enter SLEEP mode” sent via the SMBus interface.MLX90615 goes back into power-up default mode by forcing the SCL pin low for at least t DDq = 50 ms. Exitfrom Sleep is always in SMBus mode. Valid data will be available typically 0.3 seconds after the device haswoken up.Note: The previous generation IR thermometer, MLX90614 wakes up through a low pulse on the SDA line,not SCL.SCLt DDQSDA/PWMSleep commandStopSleepWake-upNormal operationFigure 10: Enter and exit Sleep3901090615 Page 14 of 30 Data SheetRev 00128/Aug/2008
MLX90615Infra Red ThermometerFigure 11: Detailed Sleep commandSCL needs to be high during Sleep. SDA can idle in each state at the same time, but the high state isrecommended as the pull-up does not add current drain. There are weak pull-ups on both SCL and SDA pins.8.5 Switching between PWM and SMBus8.5.1 PWM is enabledThe diagram below illustrates how to switch to SMBus if PWM is enabled. Note that the SCL pin needs to bekept high in order to use the PWM function. The SCL pin has on-chip a weak pull-up.SCLt REQSDA/PWMPWMStartSMBusStopFigure 12: Switching from PWM mode to SMBus3901090615 Page 15 of 30 Data SheetRev 00128/Aug/2008
Page 1 and 2: MLX90615Infra Red ThermometerFeatur
Page 3 and 4: MLX90615Infra Red Thermometer3 Tabl
Page 5 and 6: MLX90615Infra Red Thermometer6 Pin
Page 7 and 8: MLX90615Infra Red ThermometerParame
Page 9 and 10: MLX90615Infra Red Thermometer8.3.2
Page 11 and 12: MLX90615Infra Red ThermometerSpecia
Page 13: MLX90615Infra Red Thermometer8.4.3.
Page 17 and 18: MLX90615Infra Red Thermometer8.6 PW
Page 19 and 20: MLX90615Infra Red Thermometer8.7 Pr
Page 21 and 22: MLX90615Infra Red ThermometerTo, o
Page 23 and 24: MLX90615Infra Red Thermometer11.3 P
Page 25 and 26: MLX90615Infra Red Thermometer13 Sta
Page 27 and 28: MLX90615Infra Red ThermometerWhen a
Page 29 and 30: MLX90615Infra Red Thermometer17 Ref

MLX90615

Create successful ePaper yourself

Delete template?

Save as template?