User's Manual

BTLC1000-MR110CA [DATA SHEET]
Atmel-42376B-BTLC1000 Hardware Design Guide_02102015
3
Notes:
1. VBATT supply must be greater than or equal to VDDIO
1.3 Restrictions for Power States
When VDDIO is off (either disconnected or at ground potential), a voltage must not be applied to the device pins.
This is because each pin contains an ESD diode from the pin to the VDDIO supply. This diode will turn on when
a voltage higher than one diode-drop is supplied to the pin. This in turn will try to power up the part through the
VDDIO supply.
If a voltage must be applied to the signal pads while the chip is in a low power state, the VDDIO supply must be
on.
Similarly, to prevent the pin-to-ground diode from turning on, do not apply a voltage that is more than 0.3V below
ground to any pin.
1.4 Power-Up Sequence
The power-up/down sequence for BTLC1000 is shown in Figure 1. The timing parameters are provided in Table
3.
Figure 1: Power-Up Sequence
Table 3: Power-Up Sequence Timing