Pmbus Tm And Uart Interface; Test Points - Infineon Technologies XMC4000 User Manual

XMC Digital Power Explorer Power Board User Manual
UG_201511_PL30_001
Hardware Description
2.4 PMBus TM
XMC Digital Power Explorer includes a connector for communicating the buck converter with an external
interface. The connector is supplied with 3.3V from the XMC control card connector as can be seen in Figure
7 . There are 2 communication options:
PMBus through I2C interface. Pull up resistors are provided on board (R109, R105)
 TM
General purpose serial communication. In case of I2C is required, it is possible to mount resistors R103

and R104 to provide the pull up functionality. Those resistors are not populated in the PCB (DNP)
Communication connector schematic detail - (DNP = not populated component)
Figure 7
The communication can be used to send commands to XMC Digital Power Explorer. For example it is
possible to modify the Vout target value, or to read the status of the converter.
2.4.1

Test points

Within XMC Digital Power Explorer card there are a total of 22 test points that are listed in Table 4. This will
help the user to inspect different points of interest and learn how the buck converter behaves in detail.
Table 4 Test points description
Test point name Test point number
PWM_TOP TP1
PWM_BOT TP2
INJ1/INJ2 TP7/TP6
TP3,TP10, TP15, TP16
GND TP18, TP23, TP24,
TP25
VIN TP9
VOUT TP19
VOUT_FILT TP5
VOUT (ADC) TP8
Board User Manual
and UART Interface
Description
High side MOSFET PWM
signal
Low side MOSFET PWM
signal
Injection points for network
analyzers
8 GND test points for
oscilloscope probe grounding
Input voltage
Output voltage
Output voltage after additional
filtering
Vout signal delivered to XMC
ADC
Comm_connector.emf
9
Type of test point
Orange
Orange
Orange
Black/SMD
Not mounted SMD
Not mounted SMD
SMD
SMD
V1.0, 2015-10
Customer Documentation