Vaisala PMB100 Manual do Utilizador descarregar pdf (Página 7)

CHAPTER 3________________________________________________________________ OPERATION

VAISALA __________________________________________________________________________ 7

CHAPTER 3

OPERATION

Connections

The pin assignments of the PMB100 module are according to Figure

2. Connect 8...16 VDC supply voltage (typically 2 mA) to the pin VDC

and the ground plane directly to the pin GND. The output signal (0...2.5

VDC) is measured from the pin OUT and the reference signal (2.5 VDC

± 2%) from the pin REF.

If the coefficients are read from the EEPROM, the pin +5 V, SCL and

SDA are also connected. The +5 V-pin is used for supply voltage of the

EEPROM. The pins SCL and SDA are for data transfer between the

EEPROM and a microprocessor.

Temperature of the module is measured with an external T sensor,

which should be placed as close to the module as possible.

The module can also be switched to shut down mode by using a TTL

level trigger on the pin SH. A signal 0.7 V or lower activates and a

signal higher than 2 V switches the module off.

Out

VDC

GND

+ 5V

SCL

SDA

REF

Figure 2 Pin assignments

1 2 3 4 5 6 7 8 9 10 11 12 13 14

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