Linx-technologies EVM-GPS-F4 Manual do Utilizador descarregar pdf (Página 5)

– –

4 5

GND

TXM

TX_SHIFT

VCCNC

GND

OUT

VCC

MC74VHC1GT50

GND RXM

RX_SHIFT

V1.8NC

GND

OUT

VCC

MC74VHC1GT50

GP0/D

GND

GP1/C

GP2

VCC

GP3/P

VCC ON_OFF

GND

100K

VPPRFPWRUP

PGD

PGC

100K

V1.8

VPRG

VCC

GND

VBACKUP

1uF

V1.8

Vin

GND

Vout

VCC

63,8

4,7

FDFMA2P857

ON_OFF

TXM

RXM

VCC

GND

GPIOA

GPIOBGPIOC

1PPS

RFPWRUP

GPIOD

GPIOE

18pF

2.2K

100K

2.2K

GPIOD

GPIOE

1PPS

GPIOC

/RESET

RFPWRUP

ON_OFF

VCC

GPIOA

GPIOB

GND

RFIN

GND

RXM-GPS-F4

GND

2-5

ANT1

CONSMA001

GND

300ohm BEAD

V1.8

/RESET

GND

PGC

PGD

VPP MCLR

VDD

GND

PGD

PGC

Program Header

VPRG

GND

GND GND

GND

TX_SHIFT

RX_SHIFT

1PPS

RFPWRUP

GPIOC

GPIOB

GPIOA

GPIOD

GPIOE

ON_OFF

VCC

/RESET

VBACKUP

/RESET

Schematic

Power Supply Requirements

The transceiver incorporates a precision

low-dropout regulator which allows operation

over a wide input voltage range. Despite this

regulator, it is still important to provide a supply

that is free of noise. Power supply noise can

signiﬁcantly affect the module’s performance, so

providing a clean power supply for the module

should be a high priority during design.

A 10Ω resistor in series with the supply followed by a 10µF tantalum

capacitor from V

to ground helps in cases where the quality of supply

power is poor (Figure 7). This ﬁlter should be placed close to the module’s

supply lines. These values may need to be adjusted depending on the

noise present on the supply line.

10Ω

10µF

Vcc IN

Vcc TO

MODULE

Figure 7: Supply Filter

1.20”

(47.24)

0.10”

(2.54)

0.10”

(2.54)

0.10”

(2.54)

1.10”

(27.94)

1.00”

(25.40)

Ø0.04” x 10

(1.02)

PCB Layout

Figure 6: EVM-GPS-F4 PCB Layout Dimensions

1 2 3 4 5 6 7

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