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Table36 Output Drive Current Characteristics (test condition VDD=2.7~3.6V, TA=-40~105

℃)

Symbol

Parameter

Conditions

Minimum

value

Maximum

value

Unit

VOL

Output low level voltage for an I/O pin when

8 pins are sunk at same time

IIO = +8mA

2.7V<VDD<3.6V

0.49

VOH

Output high level voltage for an I/O pin when

8 pins are sourced at same time

VDD-0.4

VOL

Output low level voltage for an I/O pin when

8 pins are sunk at same time

IIO = +20mA

2.7V<VDD<3.6V

1.50

VOH

Output high level voltage for an I/O pin when

8 pins are sourced at same time

VDD-1.2

5.9.2.

NRST pin characteristics

The NRST pin input drive adopts CMOS process, which is connected with a permanent pull-up

resistor RPU.

Table 37 NRST Pin Characteristics (test condition VDD=3.3V, TA=-40~105

℃)

Symbol

Parameter

Conditions

Minimum

value

Typical

value

Maximum

value

Unit

VIL(NRST)

NRST low level input voltage

-0.5

0.8

VIH(NRST)

NRST high level input voltage

VDD+0.5

Vhys(NRST)

NRST Schmitt trigger voltage

hysteresis

200

RPU

Weak pull-up equivalent

resistance

VIN = VSS

kΩ

Note: It is obtained from a comprehensive evaluation and is not tested in production.

5.10.

Communication peripherals

5.10.1.

I2C peripheral characteristics

To achieve maximum frequency of I2C in standard mode, fPCLK1 must be greater than 2MHz. To

achieve maximum frequency of I2C in fast mode, fPCLK1 must be greater than 4MHz.

Table 38 I2C Interface Characteristics (TA=25

℃, VDD=3.3V)

Symbol

Parameter

Standard I2C

Fast I2C

Unit

Min

Max

Min

Max

tw(SCLL)

SCL clock low time

4.7

1.3

μs

tw(SCLH)

SCL clock high time

4.0

0.6

tsu(SDA)

SDA setup time

250

100

th(SDA)

SDA data hold time

3450

900

tr(SDA)/tr(SCL)

SDA and SCL rise time

1000

300

tf(SDA)/tf(SCL)

SDA and SCL fall time

300

th(STA)

Start condition hold time

4.0

0.6

μs

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