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UM2403
8.7.5
Note:
8.8
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Note:
8.8.1
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IR LED and IR receiver
The IR receiver TSOP34836 is connected to PC6 of STM32G081RBT6 and a current
around 100mA on IR LED is driven by PB9 through transistors T2 and T3 on the board.
IR LED may be driven by PB9 directly with 20mA current when SB1 is closed and SB2 is
open.
USB Type-C and Power Delivery daughterboard
The UCPD daughterboard is a development platform composed of STM32G081B-EVAL
Evaluation board. This daughterboard is used for demonstrating the functionalities of the
USB Type-C and USB Power Delivery (USB PD) technologies, facilitating the users to
develop their solutions. Refer to
The USB PD reference design on the UCPD daughterboard is used to demonstrate the
capability of STM32G081RBT6. This USB PD circuit may not pass all USB PD certifications.
The UCPD daughterboard works with VDD=3.3V. So JP16 pin1-2 must be closed on mother
board.
The UCPD daughterboard conflicts with legacy peripheral daughterboard and Motor control
on STM32G081B-EVAL Evaluation board.
USB Type-C receptacles
Two USB Type-C certified receptacles CN7 and CN5 are present on the UCPD
daughterboard, representing respectively the PORT 1 and PORT 2. PORT 1 can be used as
DRP (Dual-Role Port), which is eligible to supply another platform plugged by a USB
Type-C cable when they are configured as Provider or, otherwise, to be supplied in case of
Consumer configuration. PORT 2 can only be used as SINK.
Video signals on display port input connector (CN6) and data signals on USB3.1 Gen1
Type-B connector (CN4) are multiplexed on Type-C PORT 1 thanks to a crosspoint switch
IC TUSB546-DCI. These signals on CN6 or on CN4 have to be generated by an external
computer or notebook to evaluate the alternate mode (AM) capability of the USB PD
technology. The crosspoint switch can be configured through I2C bus, and its I2C address is
0b1000100. The cable which is plugged into CN4 can be detected by PA15.
Same as Type-C PORT1, video signals on display port output connector (CN2) are
connected to Type-C PORT 2 through another crosspoint switch IC CBTL08GP053 and
DisplayPort Linear Redriver IC SN65DP141. I2C address of CBTL08GP053 is 0b0110000
and SN65DP141's default I2C address is 0b0000000. A Type-A receptacle's (CN1) D+ and
D- signals are also connected to Type-C PORT 2 directly. Its VBUS can be set by JP3 in
Table
14.
Hardware layout and configuration
Figure 3
for daughterboard structure.
UM2403 Rev 1
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