ADS1298ECG-FE/ADS1198ECG-FE Hardware Details
39
SBAU171D – May 2010 – Revised January 2016
Copyright © 2010–2016, Texas Instruments Incorporated
ADS1298ECG-FE/ADS1198ECG-FE
Table 10. External Reference Jumper Options
Internal Reference
External Reference
ADS1298 Reference
VREF = 2.5V
VREFP = 4.096V
VREFP = 2.5V
JP25
Don't Care
2-3
1-2
JP3
Not Installed
Installed
Installed
The software uses the V
REF
value from the
Reference Voltage
control (
CONFIG3
register) in
) to calculate the input-referred voltage value for all the tests. The default value is 2.5V. If
the user is using an alternative value, the control must be updated to display the collected data to the
proper scale.
5.5
Analog Output Signals
Several output signals from the ADS1298 are provided on the J5 header.
lists the various test
signals and their location on the header. The PACEOUT pins can also be used as an auxiliary differential
input channel. Alternatively with appropriate user configuration, these pins may provide PACE detection
for use with external PACE detection circuitry (see PACE Detect Register in
Table 11. Test Signals
Signal
J5 Pin Number
Signal
PACEOUT2
1
2
PACEOUT1
NOT CONNECTED
3
4
NOT CONNECTED
PWDNB
5
6
GPIO4
DAISY_IN
7
8
GPIO3
GND
9
10
NOT CONNECTED
5.6
Digital Signals
The ADS1298 digital signals (including SPI interface signals, some GPIO signals, and some of the control
signals) are available at connector J3. These signals are used to interface to the MMB0 board DSP. The
pinout for this connector is given in
Table 12. Serial Interface Pinout
Signal
J3 Pin Number
Signal
START/CS
1
2
CLKSEL
CLK
3
4
GND
NC
5
6
GPIO1
CS
7
8
RESETB
NC
9
10
GND
DIN
11
12
GPIO2
DOUT
13
14
NC/START
DRDYB
15
16
NC
NC
17
18
GND
NC
19
20
NC
5.7
Analog Input Signals
The ADS1298ECG-FE provides users the option to feed in standard ECG signals from a patient simulator
to the DB15 connector (J1), or to feed inputs from any arbitrary signal source directly to the ADS1298.