BT 900 Specifications download pdf (Page 16)

BT900-Sx Hardware Integration Guide

Intelligent BTv4.0 Dual Mode Module

Embedded Wireless Solutions Support

Center: http://ews-support.lairdtech.com

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Parameter

Min

Typ

Max

Unit

1.8V

≥ AVCC < 2.7V 5.5-10.5 kOhm

ADC input capacitance impedance

(during operation)

9.4 pF

Note 1:

ADC input impedance is estimated mean impedance of the ADC (AIN) pins. The ADC is highly

sensitive to the impedance of the source. The ADC (AIN) input impedance is 2.2-10.5k. Normally,

when not sampling, the ADC (AIN) impedance will have very high value and can be considered an

open circuit. The moment ADC is sampling, ADC(AIN) impedance is 2.2-10.5k.

Figure 3: ADC Diagram

ext

: Output impedance of external circuit (kOhms)

ext

: Sampling time (nS)

≥ (R

AIN

+ R

ext

) x C

AIN

x 9

AIN

: Input resistor of ADC(kOhms)=2.2kOhms at 2.7V≤AVCC≤3.6V

Input resistor of ADC(kOhms)=5.5kOhms at 1.8V≤AVCC≤2.7V

AIN

: Input capacity of ADC(pF)=9.4pF at .8V≤AVCC≤3.6V

You MUST fit an external series resistor (R

ext

) when using ADC pins, whose value is selected to get required

Sample Time (T

). 1K to 10K may be suitable.

Table 7: Digital I/O Characteristics (ONLY those BT900 IO pins with names beginning with “BT_”)

Normal Operation

Min

Typ

Max

Unit

Input Voltage

VIL input logic level low -0.4 - 0.4 V

VIH input logic level high 0.7 x BT_VDD_IO - BT_VDD_IO+ 0.4 V

Output Voltage

VOL output logic level low, IOL = 4.0 mA - - 0.4 V

VOH output logic level high, IOL = 4.0 mA 0.75 x BT_VDD_IO - - V

Input and Tristate Currents

Strong pull-up -150 -40 -10 µA

Strong pull-down 10 40 150 µA

Weak pull-up -5 -1.0 -0.33 µA

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 41 42

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BT 900 Specifications Page 16

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