
XT65/XT75 Hardware Interface Overview
6.5 Pin Assignment and Signal Description
s
XT65_XT75_HO_v00.130
Page 42 of 67
2006-10-12
Confidential / Preliminary
1.
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.