MPC5644B View Datasheet(PDF) - Freescale Semiconductor
Part Name
Description
MFG CO.
'MPC5644B' PDF : 114 Pages View PDF
1 The crystal used is Epson Toyocom MC306.
2 This is the recommended range of load capacitance at OSC32K_XTAL and OSC32K_EXTAL with respect to
ground. It includes all the parasitics due to board traces, crystal and package.
3 Maximum ESR (Rm) of the crystal is 50 k
4 C0 Includes a parasitic capacitance of 2.0 pF between OSC32K_XTAL and OSC32K_EXTAL pins.
OSCON bit (OSC_CTL register)
1
0
VOSC32K_XTAL
VLPXOSC32K
90%
TLPXOSC32KSU
10%
valid internal clock
1/fLPXOSC32K
Figure 14. Slow external crystal oscillator (32 kHz) electrical characteristics
Table 37. Slow external crystal oscillator (32 kHz) electrical characteristics
Symbol
C
Parameter
Conditions1
Value2
Unit
Min Typ Max
fSXOSC SR — Slow external crystal oscillator
—
32 32.768 40 kHz
frequency
gmSXOSC CC — Slow external crystal oscillator
transconductance
VSXOSC CC T Oscillation amplitude
ISXOSCBIAS CC T Oscillation bias current
ISXOSC CC T Slow external crystal oscillator
consumption
TSXOSCSU CC T Slow external crystal oscillator
start-up time
VDD = 3.3 V ± 10%,
VDD = 5.0 V ± 10%
—
—
—
—
17.45 — 28.23 µA/V
17.79 — 29.91
1.2
1.4
1.7
V
1.2
—
4.4 µA
—
—
7
µA
—
—
23
s
1 VDD = 3.3 V ± 10% / 5.0 V ± 10%, TA = 40 to 125 °C, unless otherwise specified.
2 All values need to be confirmed during device validation.
3 Start-up time has been measured with EPSON TOYOCOM MC306 crystal. Variation may be seen with other crystal.
MPC5646C Microcontroller Data Sheet, Rev. 3
Freescale Semiconductor
Preliminary—Subject to Change Without Notice
69
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