MLX90614_15 Datasheet, PDF (19/51 Pages) Melexis Microelectronic Systems – Single and Dual Zone Infra Red Thermometer in TO-39

MLX90614 family
Single and Dual Zone
Infra Red Thermometer in TO-39
8.4.8 Sleep Mode
The MLX90614 can enter in Sleep Mode via the command “Enter SLEEP mode” sent via the SMBus
interface. This mode is not available for the 5V supply version. There are two ways to put MLX90614 into
power-up default mode:
- POR
- By Wake up request SCL pin high and then PWM/SDA pin low for at least t_DDQ > 33ms
If EEPROM is configured for PWM (EN_PWM is high), the PWM interface will be selected after
awakening and if PWM control [2], PPODB is 1 the MLX90614 will output a PWM pulse train with push-
pull output.
NOTE: In order to limit the current consumption to the typical 2.5µA Melexis recommends that the SCL pin is
kept low during sleep as there is leakage current trough the internal synthesized zener diode connected to SCL
pin. This may be achieved by configuring the MD driver of SCL pin as Push-Pull and not having Pull-Up resistor
connected on SCL line.
8.4.8.1 Enter Sleep Mode
SA_W = 0xB4
Command = 0xFF
Normal operation mode
PEC = 0xE8
Sleep mode
SDA
S1 0 1 1 0 1 0 WA 1 1 1 1 1 1 1 1 A 1 1 1 0 1 0 0 0 A P
SCL
Figure 11: Enter sleep mode command (SA = 0x5A, Command = 0xFF, PEC = 0xE8)
8.4.8.2 Exit from Sleep Mode (Wake up request)
Sleep mode
Normal mode
SDA
SCL
> 33ms
Figure 12: Exit Sleep Mode
After wake up the first data is available after 0.25 seconds (typ). On-chip IIR filter is skipped for the very
first measurement. All measurements afterwards pass the embedded digital filtering as configured in EEPROM.
Details on embedded filtering are available in application note “Understanding MLX90614 on-chip digital signal
filters”, available from www.melexis.com
3901090614
Rev 009
Page 19 of 52
Data Sheet
June 29, 2015