u-blox EVK-ANNA-B112, User Manual

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EVK-ANNA-B112 - User Guide
UBX-18018539 - R01 Product description
Page 9 of 29
Connector
annotation Pin
number Schematic
net name Description
J7 1 3V3 Regulated 3.3 V net. This net is supplied by the board and will always be powered
as long as a power source is connected.
2 3V3_PI Connects to the Raspberry Pi header’s (J14) 3V3 pins. If a Raspberry Pi is
connected, this net must be floating to prevent back currents. If a HAT is
connected, this net can be shorted to the EVK 3.3 V supply to power the HAT.
3 VBAT_DIODE To protect the battery from current back surges, connect the battery to the
ANNA-B112 module via a protection diode using this pin.
4 VDD_ANNA Connects to J22 pin 3, from where it can be connected to the module supply pin or
somewhere else.
5 VBAT B terminal
6 VDD_ANNA
Connects to J22 pin 3, from where it can be connected to the module supply pin or
somewhere else.
7 3V3 Regulated 3.3 V net. This net is supplied by the board and will always be powered
as long as a power source is connected.
8 VDD_ANNA Connects to J22 pin 3, from where it can be connected to the module supply pin or
somewhere else.
9 3V3 Regulated 3.3 V net. This net is supplied by the board and will always be powered
as long as a power source is connected.
10 VDD_MCU Supply net for the board functions not directly connected to the ANNA-B112
module; Interface MCU, USB hub, UART to USB converter etc.
11 GND Ground net.
12 GND Ground net.
J22 1 VCC ANNA-B112 module voltage supply that connects to the module VCC pin. Shorted
to the VCC_IO net via 0
Ω
resistor R4 by default.
2 VCC_IO VCC_IO pin not connected.
3 VDD_ANNA Connects to J7 pins 4, 6 and 8. Short J22 pins 1 and 3 allow the EVK to power the
ANNA-B112 module.
4 VDD_IO Supply net for LEDs and peripherals connected directly to the ANNA-B112 module.
Short J22 pins 2 and 4.
5 GND Ground net.
6 GND Ground net.
Table 2: Pinout of jumper headers J7 and J22 used to configure the board power nets
The following sections describe different jumper configurations and power scenarios that is available
on the board, including the default configuration.
⚠
Check the jumper positions carefully; if a jumper is connected in a wrong way, it can permanently
damage the components that are on the board or connected to it.
1.6.2 Default power, 3.3 V
This is the default power configuration for the evaluation board, and the jumpers are installed out of
the box with this power configuration. All board peripherals are powered up, the ANNA module is
directly supplied by the board and everything is running at 3.3 V.
Figure 8: Jumper positions for default power configuration