HT32F1653 datasheet(32/46 Pages) HOLTEK

32 / 46 page

Rev. 1.00

3� of 46

�an�a�� 01�

3�-bit ARM® Co�tex™-M3 MCU

HT3�F16�3/HT3�F16�4

Table 10 Low Speed External Clock (LSE) Characteristics

TA = ��°C, unless otherwise specified.

Symbol

Parameter

Conditions

Min

Typ

Max Unit

fLSE

Low Speed Exte�nal oscillato�

f�eq�enc� (LSE)

VDD33 = VBAT = 3.3 V

— 3�.76� — kHz

CLSE

Recommended load capacitance on

XTAL3�KIN and XTAL3�KOUT pins

—

TBD

—

RFLSE

Recommended exte�nal feedback

�esisto� between XTAL3�KIN and

XTAL3�KOUT pins

—

MΩ

DLSE

LSE oscillato� D�t� c�cle

—

IDDLSE

LSE Oscillato� Ope�ating c��ent

VDD33 = VBAT = 3.3 V�

LSESM = 0

(No�mal sta�t�p mode)

—

1.7

—

μA

ISTBLSE

LSE Oscillato� Standb� c��ent

VDD33 = VBAT = 3.3 V�

LSESM = 1

(Fast sta�t�p mode)

—

�

μA

tSULSE

LSE Oscillato� Sta�t�p time

VDD33 = VBAT = 3.3 V�

LSESM = 1

(Fast sta�t�p mode)

—

�00

—

Note: The following PCB la�o�t g�idelines a�e �ecommended to inc�ease the stabilit� of the c��stal ci�-

c�it fo� the HSE/LSE clock:

■

The crystal oscillator should be located as close as possible to the MCU to minimise trace length

thus reducing parasitic capacitance.

■

Use a ground plane as a shield under the crystal circuit to reduce the effects of noise

interference..

■

Route high frequency signals away from crystal oscillator area to prevent crosstalk.

Internal Clock Characteristics

Table 11 High Speed Internal Clock (HSI) Characteristics

TA = ��°C, unless otherwise specified.

Symbol

Parameter

Conditions

Min Typ Max Unit

fHSI

High Speed Inte�nal Oscillato�

F�eq�enc� (HSI)

VDD33 = 3.3 V�

TA = -40°C ~ +��°C

—

�

—

MHz

ACCHSI HSI Oscillato� F�eq�enc� acc��ac�

Facto��-t�immed�

VDD33 = 3.3 V�

TA = -40°C ~ +��°C

-�

—

+�

DHSI

HSI Oscillato� D�t� c�cle

VDD33 = 3.3 V� fHSI = � MHz

3�

—

6�

IDDHSI

HSI Oscillato� c��ent

VDD33 = 3.3 V� fHSI = � MHz

—

0.9�

—

tSUHSI

HSI Oscillato� Sta�t�p time

VDD33 = 3.3 V� fHSI = � MHz�

HSIRCBL = 0 (HSI Read�

Co�nte� Bits Length 7 Bits )

—

μs

Note: HSIRCBL field is in PWRCU HSIRCR register

HT32F1653 Datasheet(PDF) 32 Page - Holtek Semiconductor Inc

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