Measurement-computing BTH-1208LS Manual de usuario descargar pdf (Pagina 23)

BTH-1208LS User's Guide Specifications

Digital input/output

Table 11. Digital I/O specifications

Parameter Specification

Digital type 3.3 V open drain

Output value mapping 0 written: output drives to DGND

1 written: output is pulled up to 3.3 V via internal resistor

Number of I/O (Note 5) 8

Configuration Individually configurable

Input voltage range (Note 6) 0 V to 5.5 V

Pull up/pull-down configuration 47.5 kΩ pull-up resistors (to 3.3 V), 2.2 kΩ series resistors

Input high voltage threshold 2.0 V min

Input high voltage limit 5.5 V absolute max

Input low voltage threshold 0.8 V max

Input low voltage limit –0.5 V absolute min

0 V recommended min

Output voltage range 0 V to 3.3 V (no external pull up resistor)

0 V to 5.5 V max (Note 6 )

Output off state leakage current . (Note 7 ) 1.0 µA typ

Sink current capability 50 mA max (continuous) per pin

Transistor on resistance 0.7 Ω max

Power on and reset state USB operation: All input

Bluetooth operation: The digital I/O can either be all input at power on /

reset or may be configured to have user-configurable patterns written to the

DIO when the Bluetooth host is connected or disconnected.

Note 5: Each transistor source pin is internally connected to DGND.

Note 6: The external pull-up is connected to the digital output bit through an external pull-up resistor. Adding

an external pull-up resistor connects it in parallel with the internal 47.5 kΩ pull-up resistor of that

particular digital input/output bit. Careful consideration should be made when considering the external

pull-up resistor value and the resultant pull-up voltage produced at the load.

Note 7: Does not include the additional leakage current contribution through the internal or any external pull-

up resistor.

External trigger

Table 12. Digital trigger specifications

Parameter Specification

Trigger source External digital; TRIG terminal

Trigger mode Software configurable for edge or level sensitive, rising or falling edge, high or low

level.

Trigger latency 10 µs max

Trigger pulse width 1 µs min

Input type Schmitt trigger, 47 kΩ pull-down to ground

Schmitt trigger hysteresis 0.76 V typ

0.4 V min

1.2 V max

Input high voltage threshold 1.74 V typ

1.3 V min

2.2 V max

Input high voltage limit 5.5 V absolute max

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 29 30

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