MLX90313KDF Просмотр технического описания (PDF) - Melexis Microelectronic Systems

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MLX90313KDF

Programmable IR Sensor Interface

Melexis Microelectronic Systems  

MLX90313

Programmable IR Sensor Interface

Serial data output pin for the SPI. Data is valid on the rising edge of the serial data clock (SCLK)

SCLK

Serial data clock from the external master to be supplied to this pin. Maximum frequency = 125kHz.

CSB

Active low, chip select pin for the SPI. Communication is started on the falling edge of CS and ended on

the rising edge of CS.

TOUT1 - TOUT2:

Test pins. In normal mode, the internal clock signal of 1Mhz is present on TOUT1 and the clock of the

chopper amplifier is present on TOUT2.

CREF

Current reference output. CREF is the reference voltage output for the temperature independent current

source. The requirements for the resistor to be connected between CREF and VSS depend on the

required accuracy and range of the ambient temperature measurement. The voltage level at CREF

depends directly on the internal band-gap.

VREFP

Voltage reference I/O pin. This level is by default dependent on the on-chip band-gap reference source

and can be programmed in range 2-4.5V from eeprom . This voltage is used as reference for the DAC,

external applied potentiometer and 8-bit ADC. The chip can be configured to use an external reference

voltage instead of the on-chip reference.

The pin is protected from over-voltage and can withstand 16V

AGND

Analog ground reference pin. This voltage is derived from the on-chip band-gap and has a typical level of

2.5V for maximum output range of the amplifiers. When IROUT and/or TEMPOUT are connected directly

to the amplified analog signals, then these signals are referred to AGND. The regulator can be stopped

from the eeprom configuration register. In this case the pin can be used for external reference for the 12-

bit ADC.

The pin is protected from over voltage and can withstand 16V

VDD1

High voltage supply pin. This supply pin can be connected directly to an automotive ignition supply

voltage. The internal regulator can operate with voltages between 7V and 80V.

VDD

5V regulated supply pin. The 5V regulated voltage from the on-chip regulator is available on this pin. The

internal regulator can supply up to 20mA to external circuitry. VDD can also be used to supply the chip

directly with an external 5V regulated supply.

TEMPOUT

TEMPOUT analog output/Comparator output pin. This pin can be configured as analog output of the

MLX90313 Programmable IR sensor Interface Page 7

3901090313

Rev 1.0 21-July-2001

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