HT32F1755 Datasheet, PDF (30/45 Pages) Holtek Semiconductor Inc – Holtek 32-bit Microcontroller with ARM® Cortex™-M3 Core

32-bit ARM Cortex™-M3 MCU
HT32F1755/HT32F1765/HT32F2755
External Clock Characteristics
Table 8. High Speed External Clock (HSE) Characteristics
TA = 25°C, unless otherwise specified.
Symbol
Parameter
Conditions
Min Typ Max Unit
fHSE
High Speed External oscillator frequency (HSE) VDD33 = 3.3V
4 — 16 MHz
CHSE
Recommended load capacitance on XTAL32IN
and XTAL32OUT pins
—
— TBD — pF
RFHSE
Recommended external feedback resistor
between XTAL32IN and XTAL32OUT pins
—
— 1.0 — MΩ
DHSE
HSE Oscillator Duty cycle
—
40 — 60 %
IDDHSE
HSE Oscillator Operating Current
VDD33 = 3.3V, TA = 25°C — 0.96 — mA
ISTBHSE
HSE Oscillator Standby current
VDD33 = 3.3V, TA = 25°C — — 0.1 μA
tSUHSE
HSE Oscillator Startup time
VDD33 = 3.3V, TA = 25°C — — 4 ms
Table 9. Low Speed External Clock (LSE) Characteristics
TA = 25°C, unless otherwise specified.
Symbol
Parameter
Conditions
Min Typ Max Unit
fLSE
Low Speed External oscillator
frequency (LSE)
VDD33 = VBAT = 3.3V
— 32.768 — kHz
CLSE
Recommended load capacitance on
XTAL32KIN and XTAL32KOUT pins
—
— TBD — pF
RFLSE
Recommended external feedback
resistor between XTAL32KIN and
XTAL32KOUT pins
—
— 10 — MΩ
DLSE
LSE Oscillator Duty cycle
—
40 — 60 %
IDDLSE
LSE Oscillator Operating Current
VDD33 = VBAT = 3.3V,
LSESM = 0 (Normal startup mode)
—
1.7
— μA
ISTBLSE LSE Oscillator Standby current
VDD33 = VBAT = 3.3V, LSESM = 1
(Fast startup mode)
—3
8 μA
tSULSE
LSE Oscillator Startup time
VDD33 = VBAT = 3.3V, LSESM = 1
(Fast startup mode)
— 200 — ms
Rev. 1.00
30 of 45
August 13, 2012