EVB90614 Melexis Inc, EVB90614 Datasheet - Page 17

• Manufacturer Part Number: EVB90614
• Description: BOARD EVAL FOR MLX90614
• Manufacturer: Melexis Inc

Specifications of EVB90614

• Sensor Type: Temperature
• Sensing Range: -40°C ~ 125°C
• Interface: SMBus (2-Wire/I²C)
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: MLX90614
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -
• Sensitivity: -

8.4.4 AC specification for SMBus
8.4.4.1 Timing
The MLX90614 meets all the timing specifications of the SMBus [1]. The maximum frequency of the
MLX90614 SMBus is 100 KHz and the minimum is 10 KHz.
The specific timings in MLX90614’s SMBus are:
SMBus Request (
mode to SMBus mode – at least 1.44ms;
Timeout L is the maximum allowed time for SCL to be low. After this time the MLX90614 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 MLX90614 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 MLX90614 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 MLX90614 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 MLX90614 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 MLX90614 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].
3901090614
Rev 006
PWM/SDA
SCL
R E Q
) is the time that the SCL should be forced low in order to switch MLX90614 from PWM
T
> 27ms
imeout,L
Figure 8: SMBus timing
Page 17 of 49
MD<0,5us
SD<2,5us
Infra Red Thermometer in TO-39
T
suac
T
> 47us
imeout,H
Single and Dual Zone
MD<1,5us
SD<1,5us
T
hdac
September 30, 2010
Data Sheet