WI.232FHSS-25-R datasheet(14/67 Pages) RADIOMETRIX

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WI.232FHSS-25-R/ WI.232FHSS-250-R DATASHEET

Revision 1.1.0

to the UART for transmission to the host microprocessor. If not, it will resume scanning for another master.

If the packet received is a synchronizing packet, synchronization will be dropped if the packet address

validation fails.

Once the UART has buffered enough data to send (either regUARTMTU bytes received or regTXTO has

expired), it will schedule a transmission with the RF layer. The RF layer will make a best-effort attempt to

keep the data in at least regUARTMTU-sized packets, but will split data to better fill the communications

channel if the hop time allows. If the module is not synchronized at the time of the transmission, it votes

itself to master status, and sends a synchronizing preamble. Following a hop, the module that sends the

first transmission will vote itself to master status, send a synchronizing preamble, and communications will

resume.

2.3. Low-Power States

The module supports three power saving modes: Standby, Sleep, and Deep Sleep. Standby and Sleep

are included primarily for legacy compatibility with Wi.232DTS™ and Wi.232EUR™ products. The

hardware required to support these two low-power modes fully is not present in the Wi.232FHSS modules.

As a result, the current consumption in these two modes is considerably higher than their

Wi.232DTS™/Wi.232EUR™ counterparts. It is recommended that applications utilize the Deep Sleep

mode for power savings.

In the SLEEP and DEEP SLEEP modes, the transceiver is powered down and will not synchronize with

other modules. SLEEP mode draws more current than DEEP SLEEP mode. In DEEP SLEEP mode the

module draws the least current. To wake the module up from this mode the C2CK/RST pin must be held

low for at least 20

μs and then returned to high. Modules do not monitor the receive channel in either

SLEEP or DEEP SLEEP mode. Therefore, it is impossible to remotely wake a sleeping module via the RF

interface.

If regACKONWAKE is enabled, the module will transmit a 0x06 character out the TxD pin of the UART

once awakened from a low-power mode or power-off state. This indicates that the module is ready to

resume operations.

The following table indicates the states of the module pins while in a low-power state.

Pin Name

250-R

Number

250-R

Number

25-R

Pin State

PROC_PKT

N/A

Driven Low

TxD

Input with weak pull-up

N/A

Input with weak pull-up

N/A

Floating

N/A

Floating

C2CK/RST

Input with weak pull-up

C2D

Input with weak pull-up

N/A

Floating

CMD_RSP

Input with weak pull-up

Driven Low

RSSI

Driven Low

CMD

Input with weak pull-up

N/A

Floating

RTS

N/A

Input with weak pull-up

CTS

In Standby, Sleep: Driven Low, In Deep Sleep: Driven High

RxD

Input with weak pull-up

Table 1, Wi.232FHSS Low-Power Pin States

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