XMC4700 Datasheet, PDF (69/130 Pages) Infineon Technologies AG – Microcontroller Series for Industrial Applications

Preliminary
XMC4700 / XMC4800
XMC4000 Family
Electrical Parameters
Table 32 RTC_XTAL Parameters
Parameter
Symbol
Values
Unit Note /
Min. Typ. Max.
Test Condition
Input frequency
Oscillator start-up
time¹⁾²⁾³⁾
f_OSC SR −
32.768 −
kHz
t_OSCS
−
−
5
s
CC
Input voltage at
RTC_XTAL1
V_IX SR -0.3 −
V_BAT + V
0.3
Input amplitude (peak- V_PPX SR 0.4
−
−
V
to-peak) at
RTC_XTAL1²⁾⁴⁾
Input high voltage at
RTC_XTAL1⁵⁾
V_IHBXSR 0.6 × −
V_BAT
V_BAT + V
0.3
Input low voltage at
RTC_XTAL1⁵⁾
V_ILBX SR -0.3 −
0.36 × V
V_BAT
Input Hysteresis for
RTC_XTAL1⁵⁾⁶⁾
V_HYSX
CC
0.1 ×
V_BAT
−
V 3.0 V ≤
V_BAT < 3.6 V
0.03 ×
V_BAT
−
V
V_BAT < 3.0 V
Input leakage current at I_ILX1 CC -100 −
RTC_XTAL1
100 nA Oscillator power
down
0 V ≤ V_IX ≤ V_BAT
1) t_OSCS is defined from the moment the oscillator is enabled by the user with SCU_OSCULCTRL.MODE until the
oscillations reach an amplitude at RTC_XTAL1 of 400 mV.
2) The external oscillator circuitry must be optimized by the customer and checked for negative resistance and
amplitude as recommended and specified by crystal suppliers.
3) For a reliable start of the oscillation in crystal mode it is required that V_BAT ≥ 3.0 V. A running oscillation is
maintained across the full V_BAT voltage range.
4) If the shaper unit is enabled and not bypassed.
5) If the shaper unit is bypassed, dedicated DC-thresholds have to be met.
6) Hysteresis is implemented to avoid metastable states and switching due to internal ground bounce. It can not
be guaranteed that it suppresses switching due to external system noise.
Data Sheet
69
V0.7, 2015-10
Subject to Agreement on the Use of Product Information