STM8AF6213 datasheet(68/106 Pages) STMICROELECTRONICS

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Electrical characteristics

STM8AF6213/23/23A/26

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DocID025118 Rev 5

HSE crystal/ceramic resonator oscillator

The HSE clock can be supplied with a 1 to 16 MHz crystal/ceramic resonator oscillator. All

the information given in this paragraph is based on characterization results with specified

typical external components. In the application, the resonator and the load capacitors have

to be placed as close as possible to the oscillator pins in order to minimize output distortion

and startup stabilization time. Refer to the crystal resonator manufacturer for more details

(frequency, package, accuracy...).

Figure 18. HSE oscillator circuit diagram

Table 40. HSE oscillator characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSE

External high-speed oscillator

frequency

-1

MHz

Feedback resistor

220



C(1)

Recommended load

capacitance(2)

IDD(HSE)

HSE oscillator power

consumption

C = 20 pF,

fOSC = 16 MHz

6 (startup)

1.6 (stabilized)(3)

C = 10 pF,

fOSC = 16 MHz

6 (startup)

1.2 (stabilized)(3)

Oscillator transconductance

mA/V

tSU(HSE)(4) Startup time

VDD is

stabilized

-1

1. C is approximately equivalent to 2 x crystal CLOAD.

2. The oscillator selection can be optimized in terms of supply current using a high quality resonator with small Rm value.

Refer to the crystal manufacturer for more details.

3. Data based on characterization results, not tested in production.

4. tSU(HSE) is the startup time measured from the moment it is enabled (by software) until a stabilized 16 MHz oscillation is

reached. The value is measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer.

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