Texas Instruments MSP-EXP432P4111, User Manual

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16 SLAU747B – October 2017 – Revised January 2019
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MSP432P4111 SimpleLink™ microcontroller LaunchPad™ development kit
(MSP-EXP432P4111)
Table 3. LCD-to-MSP Connections (continued)
MSP432 Pin
Function
MSP432 LCD
Memory
Register
MSP432 Port
Pin
FH-1138P
LCD Pin
COM3 COM2 COM1 COM0
L9 LCDM9 P2.2
L8 LCDM8 P2.3
L7 LCDM7 P3.0
L6 LCDM6 P3.1 22 - COM2 - -
L5 LCDM5 P3.2
L4 LCDM4 P3.3
L3 LCDM3 P3.4 21 COM3 - - -
L2 LCDM2 P3.5 32 TMR HRT REC !
L1 LCDM1 P3.6 34 B5 B3 B1 []
L0 LCDM0 P3.7 33 B6 B4 B2 BATT
2.4.1.1 LCD Design Considerations
The LCD_F peripheral on the MSP432P4111 allows each LCD pin to be configured as either COMMON or
SEGMENT functionalities. Particular care was taken to determine LCD pin connections between the
microcontroller and the LCD on the MSP-EXP432P4111 LaunchPad. Pin connections were chosen to
optimize software ease-of-use while minimizing hardware layout complexity.
The LCD_F peripheral also features hardware animation, and up to 8 segments can be put into a
repetitive animation pattern. In 4-mux mode, the animation feature is supported on LCD pins L0 and L1.
The battery symbol on the MSP-EXP432P4111 onboard LCD consists of 8 segments and serves as a
good example to demonstrate the LCD_F animation feature. Therefore, the battery segments are
connected to L0 and L1 (see
Table 3 ).
Pins P3.5, P3.6, and P3.7 from the MSP432P4111 are connected to both the BoosterPack plug-in module
connector and the LCD. If these pins are driven with a digital voltage from either the MSP432P4111 or a
BoosterPack plug-in module, the LCD segments connected to these pins may be damaged.
2.4.2 LMT70 Temperature Sensor
The MSP432P4111 LaunchPad development kit features an LMT70 ultra-small high-precision low-power
CMOS analog temperature sensor. The analog output voltage of the LMT70 correlates directly to the
ambient temperature (see
Figure 11 ).
Figure 11. LMT70 Output Transfer Function
The analog output pin of the LMT70 is connected to Analog Input A2 (P5.3) on the MSP432P4111. The
VCC pin on the LMT70 is connected to the target side 3.3 V on the LaunchPad development kit through a
0-ohm resistor, R8. By default, R8 is not-populated to enable accurate low-power measurements of the
MSP432P4111 on the LaunchPad development kit. To enable the LMT70 to make analog temperature
measurements, populate R8 with a 0402 0-ohm resistor.
Figure 12 shows the location of R8.