MSP430F2002IPW datasheet(41/88 Pages) TI

41 / 88 page

MSP430x20x1, MSP430x20x2, MSP430x20x3

MIXED SIGNAL MICROCONTROLLER

SLAS491D -- AUGUST 2005 -- REVISED SEPTEMBER 2007

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

MSP430x20x2 electrical characteristics over recommended ranges of supply voltage and

operating free-air temperature (unless otherwise noted) (continued)

10-bit ADC, external reference (see Note 1, MSP430x20x2 only)

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX

UNIT

Positive external reference input

VeREF+ >VeREF--

SREF1 = 1, SREF0 = 0

1.4

VCC

VeREF+

Positive external reference input

voltage range (see Note 2)

VeREF-- ≤ VeREF+ ≤ VCC -- 0.15V

SREF1=1,SREF0=1(seeNote3)

1.4

3.0

VeREF--

Negative external reference input

voltage range (see Note 4)

VeREF+ >VeREF--

1.2

∆VeREF

Differential external reference input

voltage range

∆VeREF =VeREF+ -- VeREF--

VeREF+ >VeREF-- (see Note 5)

1.4

VCC

Static input current into V

0V ≤ VeREF+ ≤ VCC,

SREF1 = 1, SREF0 = 0

2.2 V/3 V

±1

μA

IVeREF+

Static input current into VeREF+

0V ≤VeREF+ ≤ VCC -- 0.15V ≤ 3V

SREF1=1,SREF0=1(seeNote3)

2.2 V/3 V

μA

IVeREF--

Static input current into VeREF--

0V ≤ VeREF-- ≤ VCC

2.2 V/3 V

±1

μA

NOTES: 1. The external reference is used during conversion to charge and discharge the capacitance array. The input capacitance, CI,isalso

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 10-bit accuracy.

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

accuracy requirements.

3. Under this condition the external reference is internally buffered. The reference buffer is active and requires the reference buffer

supply current IREFB. The current consumption can be limited to the sample and conversion period with REBURST = 1.

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

accuracy requirements.

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

with reduced accuracy requirements.

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