MSP430FR6979 Datasheet, PDF (60/163 Pages) Texas Instruments – Mixed-Signal Microcontrollers

MSP430FR6979, MSP430FR69791, MSP430FR6977
MSP430FR6928, MSP430FR6927, MSP430FR69271
SLAS797A – AUGUST 2014 – REVISED MARCH 2015
www.ti.com
Table 5-32. 12-Bit ADC, Temperature Sensor and Built-In V_1/2
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
V_SENSOR
TC_SENSOR
t_{SENSOR(sample)}
See ^{(1) (2)}
See ⁽²⁾
Sample time required if ADCTCMAP = 1 and
channel MAX–1 is selected⁽³⁾
ADC12ON = 1, ADC12TCMAP=1,
T_A = 0°C
ADC12ON = 1, ADC12TCMAP = 1
ADC12ON = 1, ADC12TCMAP = 1,
Error of conversion result ≤ 1 LSB
700
2.5
30
mV
mV/°C
µs
V_1/2
AVCC voltage divider for ADC12BATMAP = 1
on MAX input channel
ADC12ON = 1, ADC12BATMAP = 1
47.5% 50% 52.5%
I_{V 1/2}
t_{V 1/2 (sample)}
Current for battery monitor during sample time ADC12ON = 1, ADC12BATMAP = 1
Sample time required if ADC12BATMAP = 1
and channel MAX is selected⁽⁴⁾
ADC12ON = 1, ADC12BATMAP = 1
38
63 µA
1.7
µs
(1) The temperature sensor offset can be as much as ±30°C. A single-point calibration is recommended in order to minimize the offset error
of the built-in temperature sensor.
(2) The device descriptor structure contains calibration values for 30°C ± 3°C and 85°C ± 3°C for each of the available reference voltage
levels. The sensor voltage can be computed as V_SENSE = TC_SENSOR * (Temperature, °C) + V_SENSOR, where TC_SENSOR and V_SENSOR can
be computed from the calibration values for higher accuracy.
(3) The typical equivalent impedance of the sensor is 250 kΩ. The sample time required includes the sensor-on time t_SENSOR(on).
(4) The on-time t_V1/2(on) is included in the sampling time t_V1/2(sample); no additional on time is needed.
Table 5-33. 12-Bit ADC, External Reference⁽¹⁾
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
V_R+
Positive external reference voltage input VeREF+
or VeREF- based on ADC12VRSEL bit
V_R+ > V_R-
1.2
AV_CC V
V_R-
Negative external reference voltage input
VeREF+ or VeREF- based on ADC12VRSEL bit
V_R+ > V_R-
0
1.2 V
(V_R+ -
V_R-)
Differential external reference voltage input
V_R+ > V_R-
1.2
I_VeREF+
I_VeREF-
Static input current singled ended input mode
1.2 V ≤ V_eREF+≤ V_AVCC, V_eREF- = 0 V
f_ADC12CLK = 5 MHz, ADC12SHTx = 1h,
ADC12DIF = 0, ADC12PWRMD = 0
1.2 V ≤ V_eREF+≤ V_AVCC , V_eREF- = 0 V
f_ADC12CLK = 5 MHz, ADC12SHTx = 8h,
ADC12DIF = 0, ADC12PWRMD = 01
AV_CC V
±10
µA
±2.5
I_VeREF+
I_VeREF-
Static input current differential input mode
1.2 V ≤ V_eREF+≤ V_AVCC, V_eREF- = 0 V
f_ADC12CLK = 5 MHz, ADC12SHTx = 1h,
ADC12DIF = 1, ADC12PWRMD = 0
1.2 V ≤ V_eREF+≤ V_AVCC , V_eREF- = 0 V
f_ADC12CLK = 5 MHz, ADC12SHTx = 8h,
ADC12DIF = 1, ADC12PWRMD = 1
±20
µA
±5
I_VeREF+
Peak input current with single-ended input
0 V ≤ V_eREF+ ≤ V_AVCC, ADC12DIF = 0
I_VeREF+
Peak input current with differential input
0 V ≤ V_eREF+ ≤ V_AVCC, ADC12DIF = 1
C_VeREF+/- Capacitance at VeREF+ or VeREF- terminal
See ⁽²⁾
10
1.5 mA
3 mA
µF
(1) The external reference is used during ADC conversion to charge and discharge the capacitance array. The input capacitance, C_I, 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) Two decoupling capacitors, 10 µF and 470 nF, should be connected to VeREF to decouple the dynamic current required for an external
reference source if it is used for the ADC12_B. See also the MSP430FR58xx, MSP430FR59xx, MSP430FR68xx, and MSP430FR69xx
Family User's Guide (SLAU367).
60
Specifications
Copyright © 2014–2015, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Links: MSP430FR6979 MSP430FR69791 MSP430FR6977 MSP430FR6928 MSP430FR6927
MSP430FR69271