MSP430F435IPZ datasheet(61/85 Pages) TI

61 / 85 page

MSP430x43x, MSP430x44x

MIXED SIGNAL MICROCONTROLLER

SLAS344A – JANUARY 2002 – REVISED FEBRUARY 2002

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

FN_2=0

FN_3=0

FN_4=0

FN_8=0

FN_2=1

FN_3=0

FN_4=0

FN_8=0

FN_2=x

FN_3=1

FN_4=0

FN_8=0

FN_2=x

FN_3=x

FN_4=1

FN_8=0

FN_2=x

FN_3=x

FN_4=x

FN_8=1

Legend

Tolerance at Tap 27

Tolerance at Tap 2

DCO Frequency

Adjusted by Bits

29 to 2 5 in SCFI1 {N (DCO)}

Overlapping DCO Ranges:

uninterrupted frequency range

Figure 23. Five Overlapping DCO Ranges Controlled by FN_x Bits

electrical characteristics over recommended operating free-air temperature (unless otherwise

noted)

crystal oscillator, LFXT1 oscillator (see Note 1 and 2)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

OscCap = 0, VCC = 2.2 V / 3 V

Integrated inp t capacitance

OscCap = 1, VCC = 2.2 V / 3 V

C(XIN)

Integrated input capacitance

OscCap = 2, VCC = 2.2 V / 3 V

OscCap = 3, VCC = 2.2 V / 3 V

OscCap = 0, VCC = 2.2 V / 3 V

Integrated o tp t capacitance

OscCap = 1, VCC = 2.2 V / 3 V

C(XOUT)

Integrated output capacitance

OscCap = 2, VCC = 2.2 V / 3 V

OscCap = 3, VCC = 2.2 V / 3 V

NOTES:

1. The parasitic capacitance from the package and board may be estimated to be 2 pF. The effective load capacitor for the crystal is

(X(CIN) xX(COUT)) / (X(CIN) + X(COUT)). This is independent of XST_FLL.

2. To improve EMI on the low-power LFXT1 oscillator, particularly in the LF mode (32 kHz), the following guidelines should be observed.

– Keep as short of a trace as possible between the F43x/44x and the crystal.

– Design a good ground plane around the oscillator pins.

– Prevent crosstalk from other clock or data lines into oscillator pins XIN and XOUT.

– Avoid running PCB traces underneath or adjacent to the XIN and XOUT pins.

– Use assembly materials and praxis to avoid any parasitic load on the oscillator XIN and XOUT pins.

– If conformal coating is used, ensure that it does not induce capacitive/resistive leakage between the oscillator pins.

– Do not route the XOUT line to the JTAG header to support the serial programming adapter as shown in other

documentation. This signal is no longer required for the serial programming adapter.

MSP430F435IPZ Datasheet(PDF) 61 Page - Texas Instruments

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