DWM1000 Datasheet

© Decawave Ltd 2016

Version 1.7

Page 7

Parameter

Min

Typ

Max

Unit

Description

32

ns

LSB last byte to MSB next byte

10

ns

SPICSn de-asserted high to SPIMISO tri-state

16

ns

Start time; time from select asserted to first SPICLK

40

ns

Idle time between consecutive accesses

40

ns

Last SPICLK to SPICSn de-asserted

1.4

General Purpose Input Output (GPIO)

The DWM1000 provides 8 configurable pins.

On reset, all GPIO pins default to input. GPIO inputs, when appropriately configured, are capable of generating

interrupts to the host processor via the IRQ signal.

GPIO0, 1, 2, & 3, as one of their optional functions, can drive LEDs to indicate the status of various chip

operations. Any GPIO line being used to drive an LED in this way should be connected as shown. GPIO5 & 6

are used to configure the operating mode of the SPI as described in the DW1000 Datasheet [2].

See DW1000 Datasheet [2] and DW1000 User Manual [3] provide full details of the configuration and use of the

GPIO lines.

1.5

Always-On (AON) Memory

Configuration retention in lowest power states is enabled in DWM1000 by provision of an Always-On (AON)

memory array with a separate power supply, VDDAON. The DWM1000 may be configured to upload its

configuration to AON before entering a low-power state and to download the configuration when waking up from

the low

–power state.

1.6

One-Time Programmable (OTP) Memory

The DWM1000 contains a 56x32 -bit user programmable OTP memory on the DW1000 device that is used to

store per chip calibration information.

1.7

Interrupts and Device Status

DWM1000 has a number of interrupt events that can be configured to drive the IRQ output pin. The default IRQ

pin polarity is active high. A number of status registers are provided in the system to monitor and report data of

interest. See DW1000 User Manual [3] for a full description of system interrupts and their configuration and of

status registers.

1.8

MAC

A number of MAC features are implemented including CRC generation, CRC checking and receive frame filtering.

See the DW1000 Datasheet [2] and DW1000 User Manual [3] for full details.