User's Manual

H&D Wireless AB, SPB209A Application Note page 4 ( 14)
1453- SPB209A Rev E
Copyright © 2016 H&D Wireless AB, All rights reserved
Power save is an energy saving mode where SPB209A is only listening at regular intervals for the beacons
transmitted from an access point and is set in sleep mode in between. During this sleep mode, firmware is
kept in RAM but all not needed functions are turned off. Since the receive time is very short compared to
the listening interval the average current consumption is reduced significantly.
The timing of the listening interval is based on the low power oscillator clock generated internally.
2.5 Interfaces
The SPB209A is equipped with a number of interfaces that can be set up in various ways by the value on
GPIO2 and GPIO3 during boot, see section 2.5.1.
2.5.1 Host Interface SDIO and UART
The SDIO interface is SDIO 4-bit mode supporting up to 208MHz clock speed.
The High Speed UART interface default supporting Baud Rates from 1200 up to 2764800 bps, 8 bits, no
parity, 1 stop bit.
Booth GPIO2 and GPIO3 have internal pull-up and only needs to be connected via a 100kOhm resistor to
GND to be set low (0). For high level (1) the pin can be left unconnected. Table 2-1 shows the different
options. The default is to leave GPIO2 and GPIO3 unconnected (11) and SDIO as host interface for all
services.
Table 2-1: Host Interface Selection
GPIO2 GPIO3 WLAN Host Interface
BT/BLE/NFC
Host Interface
FW Download
interface
FW Download
mode
0
0
SDIO
UART
SDIO
Serial
0
1
SDIO
SDIO
SDIO
Parallel
1
0
SDIO
UART
SDIO+UART
Parallel
1
1
SDIO
SDIO
SDIO
Seri
al
2.5.2 PCM Interface
2.5.3 PCM
PCM interface is used for BT audio and can operate in master or slave mode. The interface supports the
following:
- 8, 13, 14, 15 or 16-bit samples
- 4 slots per frame with up to 16-bits per slot
- Long or short frame sync
2.5.4 Host Wake up
Wake up command via the SDIO interface. This is the normal wake up and is implemented in the FW.
There is options to use defined GPIO:s for Host Wake-up or opposite for SPB209A Wake-Up involving both
WLAN, BT and NFC. Below table outline the options.
G
PIO No.
Function
GPIO1
WLAN to Host Wake
-
up