DWM1000 Datasheet

© Decawave Ltd 2016

Version 1.7

Page 5

1

The DWM1000 module is an IEEE 802.15.4-2011 UWB implementation. RF components, Decawave DW1000

UWB transceiver, and other components reside on-module. DWM1000 enables cost effective and reduced

complexity integration of UWB communications and ranging features, greatly accelerating design implementation.

1.1

DWM1000 Functional Description

The DW1000 on board the DWM1000 is a fully integrated low-power, single chip CMOS RF transceiver IC

compliant with the IEEE 802.15.4-2011 [1] UWB standard. The DWM1000 module requires no RF design as the

antenna and associated analog and RF components are on the module.

The module contains an on-board 38.4 MHz reference crystal. The crystal has been trimmed in production to

reduce the initial frequency error to approximately 2 ppm

, using the DW1000 IC’s internal on-chip crystal trimming

circuit, see section 2.1.1.

Always-On (AON) memory can be used to retain DWM1000 configuration data during the lowest power operational

states when the on-chip voltage regulators are disabled. This data is uploaded and downloaded automatically. Use

of DWM1000 AON memory is configurable.

The on-chip voltage and temperature monitors allow the host to read the voltage on the VDDAON pin and the

internal die temperature information from the DW1000.

See the DW1000 Datasheet [2] for more detailed information on device functionality, electrical specifications and

typical performance.

1.2

DWM1000 Power Up

3.3 V Supplies

(VDDAON / VDD / VDD)

EXTON

RSTn

INIT

POWER UP

STATE

OFF

Figure 1: DWM1000 Power-up Sequence

When power is applied to the DWM1000, RSTn is driven low by internal circuitry as part of its power up

sequence. See Figure 1 above. RSTn remains low until the on-module crystal oscillator has powered up and its

output is suitable for use by the rest of the device, at which time RSTn is deasserted high.

Table 1: DW1000 Power-up Timings

Parameter

Description

Nominal

Value

Units

Voltage threshold to enable power up

2.0

V

Time at which EXTON goes high before RSTn is

released

3

ms

RSTn held low by internal reset circuit / driven low by

external reset circuit

3

ms

RSTn may be used as an output to reset external circuitry as part of system bring-up as power is applied.

An external circuit can reset the DWM1000 by asserting RSTn for a minimum of 10 ns. RSTn is an

asynchronous input. DW1000 initialization will proceed when the pin is released to high impedance. RSTn

should never be driven high by an external source.

Please see DW1000 Datasheet [2] for more details of DW1000 power up.