MSP430FR5994_17 Datasheet, PDF (60/168 Pages) Texas Instruments – Mixed-Signal Microcontrollers

MSP430FR5994, MSP430FR59941, MSP430FR5992, MSP430FR5964, MSP430FR5962
SLASE54A – MARCH 2016 – REVISED OCTOBER 2016
www.ti.com
5.11.10 Reference
The reference module (REF) generates all of the critical reference voltages that can be used by various
analog peripherals in a given device. The heart of the reference system is the bandgap from which all
other references are derived by unity or noninverting gain stages. The REFGEN subsystem consists of the
bandgap, the bandgap bias, and the noninverting buffer stage, which generates the three primary voltage
reference available in the system (1.2 V, 2.0 V, and 2.5 V). Table 5-30 lists the operating characteristics of
the built-in reference.
Table 5-30. REF, Built-In Reference
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
V_REF+
Noise
PARAMETER
Positive built-in reference
voltage output
RMS noise at VREF ⁽¹⁾
TEST CONDITIONS
REFVSEL = {2} for 2.5 V, REFON = 1
REFVSEL = {1} for 2.0 V, REFON = 1
REFVSEL = {0} for 1.2 V, REFON = 1
From 0.1 Hz to 10 Hz, REFVSEL = {0}
V_CC
2.7 V
2.2 V
1.8 V
MIN TYP MAX UNIT
2.5 ±1.5%
2.0 ±1.5% V
1.2 ±1.8%
30 130 µV
V_{OS_BUF_INT}
VREF ADC BUF_INT buffer T_A = 25 °C , ADC ON, REFVSEL = {0},
offset ⁽²⁾
REFON = 1, REFOUT=0
–16
+16 mV
V_{OS_BUF_EXT}
VREF ADC BUF_EXT
buffer offset⁽³⁾
T_A = 25 °C, REFVSEL = {0} , REFOUT=1,
REFON = 1 or ADC ON
–16
+16 mV
AV_CC(min)
AVCC minimum voltage,
Positive built-in reference
active
REFVSEL = {0} for 1.2 V
REFVSEL = {1} for 2.0 V
REFVSEL = {2} for 2.5 V
1.8
2.2
V
2.7
I_REF+
Operating supply current
into AVCC terminal⁽⁴⁾
REFON = 1
3V
19
26 µA
ADC ON, REFOUT = 0, REFVSEL = {0, 1, 2},
ADC12PWRMD = 0,
247 400
ADC ON, REFOUT = 1, REFVSEL = {0, 1, 2},
ADC12PWRMD = 0
1053 1820
I_{REF+_ADC_BUF}
Operating supply current
into AVCC terminal⁽⁴⁾
ADC ON, REFOUT = 0, REFVSEL = {0, 1, 2},
ADC12PWRMD = 1
3V
153 240 µA
ADC ON, REFOUT = 1, REFVSEL = {0, 1, 2},
ADC12PWRMD = 1
581 1030
ADC OFF, REFON=1, REFOUT=1,
REFVSEL = {0, 1, 2}
1105 1890
I_O(VREF+)
VREF maximum load
current, VREF+ terminal
REFVSEL = {0, 1, 2}, AV_CC = AV_CC(min) for
each reference level, REFON = REFOUT = 1
–1000
+10
µA
ΔVout/ΔIo
(VREF+)
Load-current regulation,
VREF+ terminal
REFVSEL = {0, 1, 2},
I_O(VREF+) = +10 µA or –1000 µA,
AV_CC = AV_CC(min) for each reference level,
REFON = REFOUT = 1
1500 µV/mA
C_VREF+/-
Capacitance at VREF+ and
VREF- terminals
REFON = REFOUT = 1
0
100 pF
TC_REF+
PSRR_DC
Temperature coefficient of
built-in reference
Power supply rejection ratio
(DC)
REFVSEL = {0, 1, 2}, REFON = REFOUT = 1,
T_A = –40°C to 85°C⁽⁵⁾
AV_CC = AV_CC(min) to AV_CC(max), T_A = 25°C,
REFVSEL = {0, 1, 2}, REFON = REFOUT = 1
24
50 ppm/K
100 400 µV/V
PSRR_AC
Power supply rejection ratio
(AC)
dAV_CC= 0.1 V at 1 kHz
3.0
mV/V
t_SETTLE
Settling time of reference
voltage ⁽⁶⁾
AV_CC = AV_CC(min) to AV_CC(max),
REFVSEL = {0, 1, 2}, REFON = 0 → 1
40
80 µs
(1) Internal reference noise affects ADC performance when ADC uses internal reference. See Designing With the MSP430FR59xx and
MSP430FR58xx ADC for details on optimizing ADC performance for the application with the choice of internal or external reference.
(2) Buffer offset affects ADC gain error and thus total unadjusted error.
(3) Buffer offset affects ADC gain error and thus total unadjusted error.
(4) The internal reference current is supplied through terminal AVCC.
(5) Calculated using the box method: (MAX(–40°C to 85°C) – MIN(–40°C to 85°C)) / MIN(–40°C to 85°C)/(85°C – (–40°C)).
(6) The condition is that the error in a conversion started after t_REFON is less than ±0.5 LSB.
60
Specifications
Copyright © 2016, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Links: MSP430FR5994 MSP430FR59941 MSP430FR5992 MSP430FR5964 MSP430FR5962