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2-3 Typical input/output, LDO external, and DC/DC circuitries
Table 2-2 Typical input/output, LDO external, and DC/DC circuitries
Input: each input IO pin is internally pulled up
by a 100K Ohm resistor (VCC=3.3V).
V
inL
V
inH
Output: each output port is an open-drain pad
with a 100K Ohm pull-up resistor and the
maximum sink current is 100 mA (VCC=3.3V).
External LDO circuitry: it is recommended to
apply low noise LDO (Low Dropout Voltage)
regulators.
External switching regulator circuitry:
Switching Frequency
Ripple V
P-P
Min.
Max.
-0.3V
0.7V
2.4V
3.6V
Min.
Max.
1 MHz
-
-
50 mV
LDO
Regulator
8
Fixed
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22u
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