HT32F52243 datasheet(32/44 Pages) HOLTEK

32 / 44 page

Rev. 1.00

�� of 44

��to�e� �� 01�

��-Bit A�m® Co�tex®-M0+ MCU

HT��F5��4�/HT��F5��5�

Table 12. Low Speed External Clock (LSE) Characteristics

TA = �5 °C, unless otherwise specified.

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

VDD

�pe�ation Range

—

�.0

—

�.6

fCK_LSE

LSE F�equen�y

VDD = �.0 V ~ �.6 V

—

��.�68

—

kHz

Inte�nal Feed�a�k Resisto�

—

MΩ

RESR

Equivalent Se�ies Resistan�e VDD = �.� V

�0

—

TBD

kΩ

Re�ommended Load

Capa�itan�es

VDD = �.� V

—

TBD

IDDLSE

�s�illato� Supply Cu��ent

(High Cu��ent Mode)

fCK_LSE = ��.�68 kHz�

RESR = 50 kΩ, CL ≥ � pF

VDD = �.0 V ~ �.� V

TA = -40 °C ~ +85 °C

—

�.�

6.�

μA

�s�illato� Supply Cu��ent

(Low Cu��ent Mode)

fCK_LSE = ��.�68 kHz�

RESR = 50 kΩ, CL < � pF

VDD = �.0 V ~ �.6 V

TA = -40 °C ~ +85 °C

—

1.8

�.�

μA

Powe� Down Cu��ent

—

0.01

μA

tsuLSE

Sta�tup Time

( Low Cu��ent Mode)

fCK_LSI = ��.�68 kHz�

VDD = �.0 V ~ �.6 V

500

—

Note: The following guidelines a�e �e�ommended to in��ease the sta�ility of the ��ystal �i��uit of the

HSE / LSE �lo�k in the PCB layout:

■

The ��ystal os�illato� should �e lo�ated as �lose as possi�le to the MCU to keep the t�a�e

lengths as sho�t as possi�le to �edu�e any pa�asiti� �apa�itan�e.

■

Shield lines in the vi�inity of the ��ystal �y using a g�ound plane to isolate signals and

�edu�e noise.

■

Keep any high f�equen�y signal lines away f�om the ��ystal a�ea to p�event any ��osstalk

adve�se effe�ts.

Internal Clock Characteristics

Table 13. High Speed Internal Clock (HSI) Characteristics

TA = �5 °C, unless otherwise specified.

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

VDD

�pe�ation Range

—

�.0

—

�.6

fHSI

HSI F�equen�y

VDD = �.� V @ �5 °C

—

MHz

ACCHSI

Fa�to�y Cali��ated HSI

�s�illato� F�equen�y

A��u�a�y

VDD = �.� V� TA = �5 °C

-�

—

�

VDD = �.5 V ~ �.6 V�

TA = -40 °C ~ +85 °C

-�

—

�

VDD = �.0 V ~ �.6 V

TA = -40 °C ~ +85 °C

-4

—

Duty

Duty Cy�le

fHSI = 8 MHz

�5

—

IDDHSI

�s�illato� Supply Cu��ent

fHSI = 8 MHz

—

�00

500

μA

Powe� Down Cu��ent

—

0.05

μA

tsuHSI

Sta�tup Tme

fHSI = 8 MHz

—

μs

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