TN0900 datasheet(3/5 Pages) STMICROELECTRONICS

3 / 5 page

TN0900

Electrical conditions and application example

Doc ID 023288 Rev 1

3/5

As a result, the device input pin electrical characteristics, should comply with the following

conditions:

In addition, the device minimum input high level voltage (VIHmin_DEVICE) should meet the

equation below:

where:

ILKGmax is the STM8T143 maximum leakage current (see the datasheet current

characteristics table).

IDI is the device input current.

Example

Below is an example of voltage adaptation between an STM8T143 powered from a 3.3 V

supply and a device input powered from 1.8 V:

If Rpull-up = 10 kΩ, and device VDD_DEVICE = 1.8 V,

since the current sunk by the output pin (IIO) = 1 mA for a specified VOL value,

then

This current value is well below the 1 mA maximum output current sunk by the STM8T143.

As a result, an Rpull-up of 10 kΩ and a device VDD of 1.8 V are fully compliant with the

maximum limit of the current sunk by the STM8T143 output pin.

At 2 V, VOLmax_STM8T143 = 0.07 V.

The device input pin electrical characteristics should consequently comply with the condition

below:

If the device input current IDI = 200nA, then

which gives:

ILmax_DEVICE

OLmax_STM8T143

IHmin_DEVICE

DD_DEVICE

pull-up

LKGmax

()

–

1.8

10000

----------------

180

μA

ILmax_DEVICE

0.07V

IHmin_DEVICE

DD_DEVICE

pull-up

–

100

–

()

–

IHmin_DEVICE

1.788V

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