MLX90616 Datasheet, PDF (16/36 Pages) Melexis Microelectronic Systems – Infra Red Thermometer in TO-39 for high temperature thermometer guns

MLX90616ESF-HCA
Infra Red Thermometer in TO-39
for high temperature thermometer guns
8.4.4 AC specification for SMBus
8.4.4.1 Timing
The MLX90616 meets all the timing specifications of the SMBus [1]. The maximum frequency of the
MLX90616 SMBus is 100 KHz and the minimum is 10 KHz.
The specific timings in MLX90616’s SMBus are:
SMBus Request (tREQ ) is the time that the SCL should be forced low in order to switch MLX90616 from PWM
mode to SMBus mode – at least 1.44ms;
Timeout L is the maximum allowed time for SCL to be low. After this time the MLX90616 will reset its
communication block and will be ready for new communication – not more than 45us;
Timeout H is the maximum time for which it is allowed for SCL to be high during communication. After this
time MLX90616 will reset its communication block assuming that the bus is idle (according to the SMBus
specification) – not more than 27ms.
Tsuac(SD) is the time after the eighth falling edge of SCL that MLX90616 will force PWM/SDA low to
acknowledge the last received byte – not more than 2.5μs.
Thdac(SD) is the time after the ninth falling edge of SCL that MLX90616 will release the PWM/SDA (so the
MD can continue with the communication) – not more than 1.5μs.
Tsuac(MD) is the time after the eighth falling edge of SCL that MLX90616 will release PWM/SDA (so that the
MD can acknowledge the last received byte) – not more than 0.5μs.
Thdac(MD) is the time after the ninth falling edge of SCL that MLX90616 will take control of the PWM/SDA
(so it can continue with the next byte to transmit) – not more than 1.5μs.
The indexes MD and SD for the latest timings are used – MD when the master device is making
acknowledge; SD when the slave device is making acknowledge. For other timings see [1].
Timeout,L
> 27ms
MD<0.5us
SD<2.5us
Tsuac
MD<1.5us
SD<1.5us
Timeou,tH Thdac
> 47us
SCL
PWM/SDA
Figure 8: SMBus timing
3901090616
Rev 002
Page 16 of 36
Data Sheet
August 20, 2012