MSP430F6776IPZ datasheet(89/157 Pages) TI

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ECCN 5E002 TSPA - Technology / Software Publicly Available

MSP430F677x

MSP430F676x

MSP430F674x

www.ti.com

SLAS768C – SEPTEMBER 2012 – REVISED APRIL 2013

REF Built-In Reference

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

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX

UNIT

REFVSEL = {2} for 2.5 V, REFON = 1

3 V

2.47

2.51

2.55

Positive built-in reference

VREF+

REFVSEL = {1} for 2 V, REFON = 1

3 V

1.96

1.99

2.02

voltage

REFVSEL = {0} for 1.5 V, REFON = 1

2.2 V, 3 V

1.48

1.5

1.52

REFVSEL = {0} for 1.5 V

2.2

AVCC minimum voltage,

AVCC(min)

Positive built-in reference

REFVSEL = {1} for 2 V

2.2

active

REFVSEL = {2} for 2.5 V

2.7

fADC10CLK = 5.0 MHz,

REFON = 1, REFBURST = 0,

3 V

µA

REFVSEL = {2} for 2.5 V

fADC10CLK = 5.0 MHz,

Operating supply current

IREF+

REFON = 1, REFBURST = 0,

3 V

16.1

µA

into AVCC terminal(1)

REFVSEL = {1} for 2 V

fADC10CLK = 5.0 MHz,

REFON = 1, REFBURST = 0,

3 V

14.4

µA

REFVSEL = {0} for 1.5 V

Temperature coefficient of

IVREF+ = 0 A,

ppm/

TCREF+

< 18

built-in reference(2)

REFVSEL = (0, 1, 2}, REFON = 1

°C

2.2 V

Operating supply current

REFON = 0, INCH = 0Ah,

ISENSOR

µA

into AVCC terminal(3)

ADC10ON = N/A, TA = 30°C

3 V

2.2 V

770

ADC10ON = 1, INCH = 0Ah,

VSENSOR

See (4)

TA = 30°C

3 V

770

2.2 V

1.06

1.1

1.14

ADC10ON = 1, INCH = 0Bh,

VMID

AVCC divider at channel 11

VMID is approximately 0.5 × VAVCC

3 V

1.46

1.5

1.54

Sample time required if

ADC10ON = 1, INCH = 0Ah,

tSENSOR(sample)

µs

channel 10 is selected(5)

Error of conversion result

≤ 1 LSB

Sample time required if

ADC10ON = 1, INCH = 0Bh,

tVMID(sample)

µs

channel 11 is selected(6)

Error of conversion result

≤ 1 LSB

AVCC = AVCC (min) - AVCC(max),

Power supply rejection ratio

PSRR_DC

TA = 25°C,

120

µV/V

(dc)

REFVSEL = (0, 1, 2}, REFON = 1

AVCC = AVCC (min) - AVCC(max),

Power supply rejection ratio

PSRR_AC

TA = 25°C, f = 1 kHz, ΔVpp = 100 mV,

6.4

mV/V

(ac)

REFVSEL = (0, 1, 2}, REFON = 1

Settling time of reference

AVCC = AVCC (min) - AVCC(max),

tSETTLE

µs

voltage(7)

REFVSEL = (0, 1, 2}, REFON = 0

→ 1

SD24_B internal reference

VSD24REF

SD24REFS = 1

3 V

1.151 1.1623

1.174

voltage

SD24_B internal reference

tON

SD24REFS = 0->1, CREF = 100 nF

3 V

200

µs

turn-on time

(1)

The internal reference current is supplied via terminal AVCC. Consumption is independent of the ADC10ON control bit, unless a

conversion is active. The REFON bit enables to settle the built-in reference before starting an A/D conversion.

(2)

Calculated using the box method: (MAX(-40 to 85°C) – MIN(-40 to 85°C)) / MIN(-40 to 85°C)/(85°C – (–40°C)).

(3)

The sensor current ISENSOR is consumed if (ADC10ON = 1 and REFON = 1) or (ADC10ON = 1 and INCH = 0Ah and sample signal is

high). When REFON = 1, ISENSOR is already included in IREF+.

(4)

The temperature sensor offset can be as much as ±20°C. A single-point calibration is recommended in order to minimize the offset error

of the built-in temperature sensor.

(5)

The typical equivalent impedance of the sensor is 51 k

Ω. The sample time required includes the sensor-on time tSENSOR(on).

(6)

The on-time tVMID(on) is included in the sampling time tVMID(sample); no additional on time is needed.

(7)

The condition is that the error in a conversion started after tREFON is less than ±0.5 LSB.

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