SAPHBCTL.
EXCBIAS
SAPHBCTL.
PGABIAS
TxBias
0
1
SAPHBCTL.
CH0EBSW
SAPHMCNF.LPBE
from ASQ
TxBias
SAPHBCTL.
PGABSW
from ASQ
RxBias
to
SDHS
SDHSCTL6.
PGA_GAIN[5:0]
from
ASQ
SAPHICTL.
MUXCTL
SAPHICTL.
MUXSEL
1
0
TxBias
RxBias
SAPHICTL.
DUMEN
ASQ_acquisition
ASQ_adc_arming
SDHS_adc_arming
SDHS_acquisition
SAPHBCTL.CPDA
Charge
Pump
en
PGA
CH1_IN
CH0_IN
Tx
Bias
PPG or
PPG_A
ASQ
PHY
PVSS
PVCC
CH1_OUT
CH0_OUT
TR0
TR1
0
0
1
1
from ASQ
SAPHBCTL.
ASQBSW
0
1
from ASQ
0
0
1
1
SAPHMCNF.LPBE
SAPHBCTL.
ASQBSW
SAPHBCTL.
CH1EBSW
from ASQ
0
1
from ASQ
0
0
1
1
SAPHMCNF.LPBE
SAPHBCTL.
ASQBSW
0
1
0
0
1
1
from
ASQ
SAPHMCNF.LPBE
SAPHMCNF.CPEO
SAPHMCNF.
BIMP
Rx
Bias
SAPHMCNF.
BIMP
Ground centric signal
TxBias centric signal
RxBias centric signal
PVcc/4 centric signal
PVcc/2 centric signal
PVcc/4 + Bias centric
Dummy
Input
Physical Interface (PHY) Block
509
SLAU367P – October 2012 – Revised April 2020
Copyright © 2012–2020, Texas Instruments Incorporated
Sequencer for Acquisition, Programmable Pulse Generator, and Physical
Interface (SAPH, SAPH_A)
NOTE: Apply Rx bias to CH1_IN while CH1_OUT is connect to GND through SWG1.
Figure 21-16. Before Reception
6. Trigger the SDHS to sample the arrived signal at the transducer 1 (TR1): CH1_IN is connected to PGA
input for data capturing. CH1_OUT is connected to GND through the SWG1 switch (see
).