EM357-RTR datasheet(14/241 Pages) SILABS

14 / 241 page

Rev 1.3

2.5. Digital I/O Specifications

Table 2.5 lists the digital I/O specifications for the EM35x. The digital I/O power (named VDD_PADS) comes from

three dedicated pins (pins 23, 28 and 37). The voltage applied to these pins sets the I/O voltage.

Table 2.5. Digital I/O Specifications

Parameter

Test Condition

Min

Typ

Max

Unit

Voltage supply (regulator input voltage)

2.1

—

3.6

Low Schmitt switching threshold

VSWIL

Schmitt input threshold going

from high to low

0.42 x

VDD_PADS

—

0.50 x

VDD_PADS

High Schmitt switching threshold

VSWIH

Schmitt input threshold going

from low to high

0.62 x

VDD_PADS

—

0.80 x

VDD_PADS

Input current for logic 0

IIL

—

–0.5

μA

Input current for logic 1

IIH

—

+0.5

μA

Input pull-up resistor value

RIPU



Input pull-down resistor value

RIPD



Output voltage for logic 0

VOL

(IOL = 4 mA for standard pads,

8 mA for high current pads)

—

0.18 x

VDD_PADS

Output voltage for logic 1

VOH

(IOH = 4 mA for standard pads,

8 mA for high current pads)

0.82 x

VDD_PADS

—

VDD_PADS

Output source current



(standard current pad)

IOHS

—

Output sink current



(standard current pad)

IOLS

—

Output source current high current pad:

PA6, PA7, PB6, PB7, PC0

IOHH

—

Output sink current high current pad:

PA6, PA7, PB6, PB7, PC0

IOLH

—

Total output current (for I/O Pads)

IOH + IOL

—

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