Application Note
page 23 of 32
V1.0
2021-03-31
Distance2GoL (Software-Controlled FMCW) low-power radar shield using
BGT24LTR11 for range detection and human tracking
External pin header connectors
Pin no.
Signal name
Pin description
7
IF_S&H_EN
Control signal for IF S&H switches (U2 and U3)
8
VCC_DIV_EN
Control signal for
PMOS switch (Q2) to turn MMIC’s divider on/off
Table 8
External headers (P2)
–
pin description
Pin no.
Signal name
Pin description
1
SCL
(I2C_EEPROM.SCL) serial clock input of the EEPROM
2
SDA
(I2C_EEPROM.SDA) serial data pin of the EEPROM
3
AREF
3.3 V power supply to Arduino
4
Ground
Ground
7
ARD_PWM_
ARD_BB1_EN: control signal to turn on/off the first stage of
baseband amplification
8
ARD_PWM_
ARD_V_PTAT_S&H_EN: control signal for V_PTAT
9
ARD_PWM_
ARD_IF_S&H_EN: control signal for S&H switches for IFI and IFQ
Table 9
External headers (P3)
–
pin description
Pin no.
Signal name
Pin description
2
IOREF
Reference signal
4
3V3
3.3 V power supply to Arduino
5
5V
5 V power supply to Arduino
6
Ground
Ground
7
Ground
Ground
Table 10
External headers (P4)
–
pin description
Pin no.
Signal name
Pin description
2
ARD_PWM_
ARD_VCC_PTAT: control signal to turn PTAT on/off
3
ARD_PWM
ARD_TX_EN: control signal for turning the TX of BGT24LTR11
on/off
5
ARD_PWM_
ARD_VCC_BGT_EN: control signal for turning the BGT24LTR11
on/off (via Q1 PMOS)
Table 11
External headers (P5)
–
pin description
Pin no.
Signal name
Pin description
1
ARD_ADC_0
IFI_HG signal from the second baseband stage. Place R94 (0
Ω
)
and remove R93 to see IFI_LG signal from the first baseband
stage.
2
ARD_ADC_1
IFQ_HG signal from the second baseband stage. Place R96 (0
Ω
) and remove R95 to see IFQ_LG signal from the first
baseband stage.
3
ARD_ADC_2
IFI_LG signal from first baseband stage
4
ARD_ADC_3
IFQ_LG signal from first baseband stage
5
ARD_ADC_4
V_PTAT_OUT: V_PTAT signal
