Electronic Paper Display (Epd); Jp4 (Idd ); Table 6. Nfc Connector Pinout; Figure 9. Jumper Jp4 In Position Off - ST STM32L053 User Manual

UM1775
The NFC board can be accessed in the SPI or UART mode.
CN1 pin
1
2
3
4
5
6
7
8
6.6

Electronic paper display (EPD)

The STM32L053 Discovery board includes an E-paper display with high contrast, high
reflectance and ultra-wide viewing angle.
This display is a TFT active matrix electrophoretic display. The 2.13" active area contains
122×250 pixels and it is capable to display images at 1-bit white, black full display
capabilities. An associated integrated circuit contains the buffers, interface, control logic,
oscillator, and DC-DC converter.
The STM32L053C8T6 controls this peripheral and is able to switch off its power supply.
6.7 JP4 (I
DD
Jumper JP4, labeled Idd, allows STM32L053C8T6 consumption direct measurement by a
module on board able to measure from 100 nA to 50 mA or by removing the jumper and
connecting an ammeter.
•
Jumper in position OFF: STM32L053C8T6 is powered (default).

Table 6. NFC connector pinout

NFC signals STM32L053C8T6
NFC_IRQOUTN
PB7
or UART1_TX
NFC_IRQINN or
PB6
UART1_RX
NFC_NSS PB12
NFC_MISO PB14
NFC_MOSI PB15
NFC_SCK PB13
+3V3 -
GND -
)

Figure 9. Jumper JP4 in position OFF

Interrupt output for NFC connected to
STM32L053C8T6 UART1 RX
Interrupt input for CR95HF connected to
STM32L053C8T6 UART1 TX
SPI slave select
SPI data, slave output
SPI data, slave input
SPI serial clock
Main power supply/power supply for RF drivers
Ground
UM1775 Rev 4
Hardware layout
Description
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