User Guide
17 of 46
Rev. 1.0
2022-03-09
48V Battery Switch Reference Design
R 48V BATT Switch10
System and functional description
2.2.8
Microcontroller interface
The 20-pin connector X11 provides the interface of the power board to the microcontroller. For the connector
pin assignment see Table 5 below. Figure 18 shows the port and pin assigment of those signals for the
microcontroller.
Figure 17
Table 5
Pin Assignment Microcontroller Interface Connector
PIN
Label
Function
1
VREF
TLE4972- AE35D5 Reference Voltage (Output)
2
AOUT
TLE4972- AE35D5 Analog Out
3
VDD_S
TLE4972- AE35D5 Sensor Supply
4
OCD1
TLE4972- AE35D5 Overcurrent Detection Output 1
5
GND_S
TLE4972- AE35D5 Sensor Ground
6
OCD2
TLE4972- AE35D5 Overcurrent Detection Output 2
7
NTC1
Thermistor
8
VLD_F
Load Voltage
9
VBAT_F
Battery Voltage
10
FW
Freewheeling (Gate of freewheeling MOSFET)
11
SAF
2ED4820-EM SAFESTATEN (Safe State Enable)
12
INT
2ED4820-EM INT (Interrupt)
13
SCLK
2ED4820-EM SCLK (SPI Clock)
14
CSN
2ED4820-EM CSN (SPI Chip Select)
15
MOSI
2ED4820-EM MOSI (SPI Master Out Slave In)
16
MISO
2ED4820-EM MISO (SPI Master In Slave Out)
17
EN
2ED4820-EM EN (Enable)
18
VDD
2ED4820-EM VDD (Digital Supply Voltage 3.3 V)
19
CSO
2ED4820-EM CSO (Current Sense Output)
20
GND
Ground
