STM32F373RBT7(2013) データシートの表示（PDF） - STMicroelectronics

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STM32F373RBT7
(Rev.:2013)

ARM Cortex-M4 32b MCU+FPU, up to 256KB Flash+32KB SRAM timers, 4 ADCs (12/16-bit), 3 DACs, 2 comp., 2.0-3.6 V operation

STMicroelectronics 

Electrical characteristics

STM32F37xxx

Figure 13. Low-speed external clock source AC timing diagram

tW(LSEH)

VLSEH

90%

10%

VLSEL

tr(LSE)

tf(LSE)

tW(LSEL)

t

TLSE

MS19215V2

High-speed external clock generated from a crystal/ceramic resonator

The high-speed external (HSE) clock can be supplied with a 4 to 32 MHz crystal/ceramic

resonator oscillator. All the information given in this paragraph are based on design

simulation results obtained with typical external components specified in Table 40. 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 on the resonator characteristics

(frequency, package, accuracy).

Symbol

Table 40. HSE oscillator characteristics

Parameter

Conditions(1)

Min(2) Typ Max(2) Unit

fOSC_IN Oscillator frequency

RF Feedback resistor

During startup(3)

4

8

32 MHz

- 200 -

kΩ

-

- 8.5

VDD = 3.3 V, Rm= 30 Ω,

CL= 10 pF@8 MHz

- 0.4

-

VDD = 3.3 V, Rm= 45 Ω,

CL= 10 pF@8 MHz

- 0.5

-

IDD HSE current consumption

VDD = 3.3 V, Rm= 30 Ω,

CL=5 pF@32 MHz

- 0.8

-

mA

VDD = 3.3 V, Rm= 30 Ω,

CL= 10 pF@32 MHz

-

1

-

VDD = 3.3 V, Rm= 30 Ω,

CL= 20 pF@32 MHz

- 1.5

-

gm Oscillator transconductance

tSU(HSE)(4) Startup time

Startup

VDD is stabilized

10

-

-

2

- mA/V

-

ms

1. Resonator characteristics given by the crystal/ceramic resonator manufacturer.

2. Guaranteed by design, not tested in production.

3. This consumption level occurs during the first 2/3 of the tSU(HSE) startup time

4. tSU(HSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 8 MHz

oscillation is reached. This value is measured for a standard crystal resonator and it can vary significantly

with the crystal manufacturer

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DocID022691 Rev 4

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