Rainbow-electronics MAX1099 Manual do Utilizador descarregar pdf (Página 17)

The transistor must be a small-signal type with a base

resistance less than 100Ω. Tight specifications for for-

ward current gain (+50 to +150, for example) indicate

that the manufacturer has good process controls and

that the devices have consistent V

characteristics.

(See Table 6 for recommended devices.)

For heatsink mounting, the 500-32BT02-000 thermal

sensor from Fenwal Electronics is a good choice. This

device consists of a diode-connected transistor, an alu-

minum plate with screw hole, and twisted-pair cable

(Fenwal Inc., Milford MA, 508-478-6000).

Twisted-Pair and Shielded Cables

For remote-sensor distances greater than 8 inches, or

in particularly noisy environments, use a twisted-pair

cable. A practical length is 6 feet to 12 feet. For longer

distances, the best solution is a shielded twisted-pair

cable such as that used for audio microphones. For

MAX1098/MAX1099

10-Bit Serial-Output Temperature Sensors

with 5-Channel ADC

_______________________________________________________________________________________ 17

SEL3 SEL2 SEL1 SEL0 POSITIVE INPUT (IN+) NEGATIVE INPUT (IN-)

0000 AIN0 AIN5

0001 AIN1 AIN5

0010 AIN2 AIN5

0011 AIN3 AIN5

0100 AIN4 AIN5

0101 ——

0110 AIN5 AIN5

0111 Internal diode anode* Internal diode cathode

1000 AIN0 AIN1

1001 AIN2 AIN3

1010 ——

1011 V

/4 GND

1100 External diode 1 anode* (AIN0) External diode 1 cathode (AIN1)

1101 External diode 2 anode* (AIN2) External diode 2 cathode (AIN3)

1110 ——

1111 ——

*Temperature-measurement mode

Table 4. Input Selection

Table 6. Remote-Sensor Transistor

Manufacturers

MANUFACTURER MODEL NUMBER

Central Semiconductor

(USA)

CMPT3904

Fairchild Semiconductor

(USA)

MMBT3904

Motorola (USA) MMBT3904

Rohm Semiconductor

(Japan)

SST3904

Siemens (Germany) SMB3904

Zetex (England) FMMT3904CT-ND

Table 5. Output Data Format

D9 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 S0 S 1S 200

1 2 ... 12 13 14 15 16 17 18 19 20

MAX1098/MAX1099 1

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