STM8L101X2 datasheet(59/88 Pages) STMICROELECTRONICS

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STM8L101x1 STM8L101x2 STM8L101x3

Electrical parameters

Figure 36. Typical application with I2C bus and timing diagram 1)

1. Measurement points are done at CMOS levels: 0.3 x VDD and 0.7 x VDD.

9.3.8

Comparator characteristics

Table 33. Comparator characteristics

Symbol

Parameter

Conditions

Min (1)

Typ

Max(1)

Unit

VIN(COMP_REF)

Comparator external reference

-0.1

VDD-1.25

VIN

Comparator input voltage range

-0.25

VDD+0.25

Voffset(2)

Comparator offset error

±20

tSTART

Startup time (after BIAS_EN)

3(1)

µs

IDD(COMP)

Analog comparator consumption

25(1)

µA

Analog comparator consumption

during power-down

60(1)

tpropag(2)

Comparator propagation delay

100-mV input step

with 5-mV overdrive,

input rise time = 1 ns

2(1)

µs

1. Guaranteed by design.

2. The comparator accuracy depends on the environment. In particular, the following cases may reduce the accuracy of the

comparator and must be avoided:

- Negative injection current on the I/Os close to the comparator inputs

- Switching on I/Os close to the comparator inputs

- Negative injection current on not used comparator input.

- Switching with a high dV/dt on not used comparator input.

These phenomena are even more critical when a big external serial resistor is added on the inputs.

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