Siemens XT75 Especificações descarregar pdf (Página 42)

XT65/XT75 Hardware Interface Overview

6.5 Pin Assignment and Signal Description

XT65_XT75_HO_v00.130 Page 42 of 67 2006-10-12

Confidential / Preliminary

Restrictions during SLEEP mode:

During SLEEP Mode the ADC is shut down temporarily (per default). Please make sure that during SLEEP Mode

shutdown the ADCx_IN input voltage does not exceed ±0.3V. The input current (reverse feeding) may reach 3mA!

If SLEEP Mode is activated there are three protection possibilities:

- Use an RC combination for current limitation.

Advantages: Lowest current consumption at SLEEP Mode, small component count, high input resistance

Disadvantages: Lower input resistance at Sleep Mode (100k only).

- Use the AT^SNFM=,1 command to enable the ADC supply continuously .

Advantages: No additional component components needed.

Disadvantages: Higher current consumption in SLEEP (about 2mA)

- Detect presence of VMIC-voltage. If VMIC is off, make sure that ADCx_IN input voltages does not exceed ±0.3V

Advantages: Lowest current, high input resistance.

Disadvantages: Effort for SLEEP Mode (VMIC) detection.

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