Datasheet

1245
SAM9G35 [DATASHEET]
11053E–ATARM–10-Mar-2014
The Pen Detection Sensitivity is programmable by an ADC internal resistor. This resistor is set depending on the value of
the PENDETSENS field in ADC_ACR, offset 0x94 in the ADC User Interface.
46.14 POR Characteristics
A general presentation of Power-On-Reset (POR) characteristics is provided in Figure 46-5.
Figure 46-5. General Presentation of POR Behavior
When a very slow (versus t
RES
) supply rising slope is applied on POR VDD pin, the reset time becomes negligible and the
reset signal is released when V
DD
rises higher than V
th+
.
When a very fast (versus
t
RES
) supply rising slope is applied on POR VDD pin, the voltage threshold becomes negligible
and the reset signal is released after
t
RES
time. It is the smallest possible reset time.
Table 46-28. Pen Detection Sensitivity
ADC_ACR [1:0] Resistor (kΩ)
0200
1150
2 100 (default)
350
Dynamic
t
res
NRST
VDD
V
th+
V
th
-
Vop
Static
Vnop