EVK-M91 - User guide
Pin no.
Pin name
I/O
Level
Description
11
BCKP I1
O
3.0 V
Backup supply current measurement node 1. Connected to
backup supply (super capacitor). Current measured over a
100
Ω
1% resistor between pins 11 (BCKP I1) and 10 (BCKP
I2). Pin 11 (BCKP I1) is at higher potential.
10
BCKP I2
O
3.0 V
Backup supply current measurement node 2. See
description for pin 11.
9
VBCKP IN
I
3.0 V
Backup power supply input – optional input for testing
backup operation
8
TIMEPULSE
O
3.0 V
Time pulse signal
7
EXTINT
I
3.0 V
External interrupt, can be used for time aiding
6
PIO8
I/O
3.0 V
Generic input/output (PIO8)
5
SDA/CS
I/O
3.0 V
If slide the interface switch on I2C, then I2C interface
selected; Function: data input / output
If slide the interface switch on SPI, then SPI interface
selected; chip select input – LOW ACTIVE
4
SCL/SCK
I
3.0 V
Clock input. Can also be used as generic input/output
(PIO4).
3
TxD/MISO
O
3.0 V
Serial port transmit or SPI slave transmit, operation
selected by interface switch
2
RxD/MOSI
I
3.0 V
Serial port receive or SPI slave receive, operation selected
by interface switch
1
GND
I
–
Recommended common ground pin
Table 5: EVK-M91 14 pin connector pin description
Figure 3: EVK-M91 example 5 V DC power supply
When using the 3.0 V digital interfaces with your application (e.g. SPI or I2C), a cable length
less than 25 cm is recommended.
5.1.4 SPI
The SPI interface pins are available on 14-pin connector, see section
for more
information.
If using the SPI interface, the
5.1.5 I2C
The 14-pin connector contains pins for evaluating I2C bus communication. If using I2C, the
UBX-19056858 - R04
5 Device description
Page 12 of 27
C1-Public
Содержание EVK-M91-00-01
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