MPC5645B datasheet(69/114 Pages) FREESCALE

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MPC5646C Microcontroller Data Sheet, Rev. 3

Preliminary—Subject to Change Without Notice

Freescale Semiconductor

Figure 14. Slow external crystal oscillator (32 kHz) electrical characteristics

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 (R

m) of the crystal is 50 k

4 C0 Includes a parasitic capacitance of 2.0 pF between OSC32K_XTAL and OSC32K_EXTAL pins.

Table 37. Slow external crystal oscillator (32 kHz) electrical characteristics

Symbol

Parameter

Conditions1

1 V

DD = 3.3 V ± 10% / 5.0 V ± 10%, TA = 40 to 125 °C, unless otherwise specified.

Value2

2 All values need to be confirmed during device validation.

Unit

Min

Typ

Max

fSXOSC

SR — Slow external crystal oscillator

frequency

—

32.768

kHz

gmSXOSC

CC — Slow external crystal oscillator

transconductance

VDD = 3.3 V ± 10%,

17.45

—

28.23

µA/V

VDD = 5.0 V ± 10%

17.79

—

29.91

VSXOSC

CC T Oscillation amplitude

—

1.2

1.4

1.7

ISXOSCBIAS CC T Oscillation bias current

—

1.2

—

4.4

µA

ISXOSC

CC T Slow external crystal oscillator

consumption

——

—

µA

TSXOSCSU CC T Slow external crystal oscillator

start-up time

——

—

3 Start-up time has been measured with EPSON TOYOCOM MC306 crystal. Variation may be seen with other crystal.

OSCON bit (OSC_CTL register)

TLPXOSC32KSU

VOSC32K_XTAL

VLPXOSC32K

valid internal clock

90%

10%

1/fLPXOSC32K

MPC5645B Fiches technique(PDF) 69 Page - Freescale Semiconductor, Inc

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