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Original question:

PGA450Q1EVM: Curve of IN pin of PGA450Q did not chagne

PGA450Q1EVM: How can I get 15cm of distance?

WonGeun Yoo
Prodigy 230 points
Part Number: PGA450Q1EVM
Other Parts Discussed in Thread: PGA460

Dear Akeem,

Many thanks

I confirmed a correct signal though I can't get the signal from 50cm to 150cm so that I changed the value of burst count from 0x01 to 0x0F in short mode so work is well

A range in short mode is from 15cm to 150cm but I can't get a distance of object as 15cm when returning 20cm

How can I get 15cm of distance? and if the burst count is increase, do I need to increase blanking timer ?

If I have to need, Please let me know a way of calculation

Wongeun

  • 0
    TI__Mastermind 27940 points

    Hi WonGeun,

    You will need to optimize your short range settings for the 15cm to 150cm range. Using the PGA450 EVM with the Murata MA58AF14-0N, the default tuning capacitor of 2nF, and manually adjusting the Mitsumi K5-R4 transformer , I can detect as low as ~20cm. To further optimize short range detection down to 15cm, you may need to adjust the tuning capacitor value, and add a damping resistor as described in Section 3,4 Passive Tuning of the PGA460 Ultrasonic Module Hardware and Software Optimization app note ( http://www.ti.com/lit/an/slaa732/slaa732.pdf ).

    Here are the short range results and ESFR register settings using the default EVM hardware for 20cm to ~150cm object detection:

    GRID_ESFR.txt 
    ;GRID_ESFR
92 (BPF_B1_MSB),04
93 (BPF_B1_LSB),95
94 (BPF_A2_MSB),EB
95 (BPF_A2_LSB),85
96 (BPF_A3_MSB),F7
97 (BPF_A3_LSB),4D
A1 (LPF_B1_MSB),0D
A2 (LPF_B1_LSB),8C
A3 (LPF_A2_MSB),64
A4 (LPF_A2_LSB),E8
A5 (DOWNSAMPLE),19
A6 (BURST_ONA_MSB),00
A7 (BURST_ONA_LSB),8A
A9 (BURST_OFFA_MSB),00
AA (BURST_OFFA_LSB),8A
AB (BURST_ONB_MSB),00
AC (BURST_ONB_LSB),8A
AD (BURST_OFFB_MSB),00
AE (BURST_OFFB_LSB),8A
AF (PULSE_CNTA),09
B1 (PULSE_CNTB),09
B2 (DEADTIME),05
B3 (BURST_MODE),00
B4 (TEMP_SENS),EA
B5 (SAT_DEGLITCH),00
B6 (SAT_TIME),00
B7 (CONTROL_1),08
B9 (BLANKING_TMR),00
BA (FRT_MSB),00
BB (FRT_LSB),00
BC (GPIO_CTRL),00
BD (CLK_SEL),00
BE (WD_EN),00
BF (LIN_SCI),00
C0 (EE_CTRL),00
C1 (STATUS1),00
C2 (STATUS2),00
C3 (PWR_MODE),01
C4 (DP_SCI_CTRL),00
C5 (FIFO_CTRL),07
C6 (ECHODATA_MSB),00
C7 (ECHODATA_LSB),00
C8 (EN_CTRL),09
C9 (RX_DATA0),00
CA (RX_DATA1),00
CB (RX_DATA2),00
CC (RX_DATA3),00
CD (RX_DATA4),00
CE (RX_DATA5),00
CF (RX_DATA6),00
D1 (RX_DATA7),00
D2 (LIN_PID),00
D3 (TX_DATA0),00
D4 (TX_DATA1),00
D5 (TX_DATA2),00
D6 (TX_DATA3),00
D7 (TX_DATA4),00
D8 (TX_DATA5),00
D9 (TX_DATA6),00
DA (TX_DATA7),00
DB (DATA_CNT),00
DC (LIN_CFG),40
DD (LIN_CTRL),00
DE (LIN_STATUS),00
DF (FIFO_POINTER_MSB),02
E1 (FIFO_POINTER_LSB),FF
E2 (VREG_SEL),00
E3 (SYNC_COUNT_MSB),00
E4 (SYNC_COUNT_LSB),00
E5 (TEMP_DAC_CTRL),00
E6 (OSC_SYNC_CTRL),20
E9 (ANALOG_MUX),00
EA (DIGITAL_MUX),00
EOF