MSP430F5632IPZ datasheet(59/101 Pages) TI

59 / 101 page

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AmbientTemperature- ˚C

MSP430F563x

www.ti.com

SLAS650A – JUNE 2010 – REVISED JULY 2010

Figure 8. Typical Temperature Sensor Voltage

REF, External Reference

over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)

(1)

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX

UNIT

Positive external reference

VeREF+

VeREF+ > VREF–/VeREF–

(2)

1.4

AVCC

voltage input

Negative external

VREF–/VeREF–

VeREF+ > VREF–/VeREF–

(3)

1.2

reference voltage input

(VeREF+ –

Differential external

VeREF+ > VREF–/VeREF–

(4)

1.4

AVCC

VREF–/VeREF–)

reference voltage input

1.4 V

≤ VeREF+ ≤ VAVCC , VeREF– = 0 V,

fADC12CLK = 5 MHz, ADC12SHTx = 1h,

2.2 V/3 V

TBD

µA

Conversion rate 200 ksps

IVeREF+ ,

Static input current

IVREF–/VeREF–

1.4 V

≤ VeREF+ ≤ VAVCC , VeREF– = 0 V,

fADC12CLK = 5 MHz, ADC12SHTx = 8h,

2.2 V/3 V

TBD

µA

Conversion rate 20 ksps

IVeREF+

Peak input current

0 V

≤ VeREF+ ≤ VAVCC

TBD

µA

Capacitance at VREF+/-

CVREF+/-

(5)10

µF

terminal

(1)

The external reference is used during ADC conversion to charge and discharge the capacitance array. The input capacitance, Ci, is also

the dynamic load for an external reference during conversion. The dynamic impedance of the reference supply should follow the

recommendations on analog-source impedance to allow the charge to settle for 12-bit accuracy.

(2)

The accuracy limits the minimum positive external reference voltage. Lower reference voltage levels may be applied with reduced

accuracy requirements.

(3)

The accuracy limits the maximum negative external reference voltage. Higher reference voltage levels may be applied with reduced

accuracy requirements.

(4)

The accuracy limits minimum external differential reference voltage. Lower differential reference voltage levels may be applied with

reduced accuracy requirements.

(5)

Two decoupling capacitors, 10µF and 100nF, should be connected to VREF to decouple the dynamic current required for an external

reference source if it is used for the ADC12_A. See also the MSP430x5xx Family User's Guide (SLAU208).

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