ADP5090-2-EVALZ User Guide
UG-782
Rev. A | Page 5 of 9
J4 OUTPUT CONNECTOR
The J4 output connector (see Figure 9) connects the demo
board to the load. As well as providing power, the connector
also has other interface connections that allow more interaction
between the demo board and the host microcontroller unit
(MCU) on the load. The connector is directly compatible with
the Analog Devices
demo boards. Table 2 shows the pinout
of the J4 output connector and provides a brief description of the
pin functions.
Table 2. J4 Output Connector
Pin
No.
Mnemonic Description
1
VOUT
Output voltage supply from the demo
board to the load
2
PGOOD
PGOOD output signal from the
3
GND
Ground
4
DIS_SW
DIS_SW input signal to the
5
BATT
Supercapacitor voltage (for battery
monitoring)
6
EN
Enable LDO
7
BACK_UP
Backup voltage (for battery monitoring)
8
NC
No connect
R23
NC
R22
1M
J4
OUTPUT
1
2
3
4
5
6
7
8
PGOOD
EN
R19
0
DIS_SW
R16
NC
R20
NC
R17
NC
R21
NC
BATT
BACK_UP
12830-
013
Figure 9. J4 Output Connector
A detailed description of each J4 output connector pin is as
follows:
•
The VOUT pin (Pin 1) is the output voltage that the demo
board delivers to the load.
•
has a programmable PGOOD signal. When
the PGOOD threshold is reached, the
sets the
PGOOD pin (Pin 2) high. The pin is connected to the host
MCU GPIO input. See the
information on this function.
•
The GND pin (Pin 3) is the ground connection for the
•
Connect the DIS_SW pin (Pin 4) to the host MCU GPIO
output. If the host MCU requires the
to temporarily
halt the switching regulator function, set this pin high. See
the
data sheet for more detailed information on
this function.
•
Connect the BATT pin (Pin 5) to the analog input of the
host MCU to monitor the voltage on the supercapacitor of
the
).
Populating Resistor R17 and Resistor R21 creates a resistor
divider for cases where the MCU analog input range is
lower than the supercapacitor voltage.
•
The EN pin (Pin 6) is the enable control signal for the
LDO regulator on the
demo board
). Connect this pin to the host MCU
GPIO output to enable or disable the
•
Connect the BACK_UP pin (Pin 7) to the analog input of
the host MCU to monitor the voltage on the supercapacitor
of the
demo board (
).
Populating Resistor R16 and Resistor R20 creates a resistor
divider for cases where the MCU analog input range is
lower than the supercapacitor voltage.
•
The NC pin (Pin 8) is the no connect pin. Do not use this pin.
