S2-LP datasheet(63/90 Pages) STMICROELECTRONICS

63 / 90 page

S2-LP

Link layer protocol

DocID029944 Rev 1

63/90

Figure 12: Automatic retransmission scenario

8.2

Timeout protocol engine

The S2-LP provides programmable timers to reach the lowest low power consumption

while at the same time keeping an efficient communication link.

Table 55: Timer description and duration (the values are related to fdig of 26 MHz)

Timer

name

Description

fsource

Time

step

[µs]

Max time

Formula

timer

Once is

expired the

reception

ends.

��

1210

~46

~3s

��

∗ ((�� + 1) ∗ �� − 1)

PRESCALER : register 0x47

COUNTER: register 0x46

LDC

timer(1)

Set the wake

up period

during LDC

operations

��,

��

~29

~58

~116

~232

~2s

~4s

~8s

~16s

��

∗ (�� + 1) ∗ (�� + 1)

PRESCALER : register 0x48, 0x4A

COUNTER: register 0x49, 0x4B

Sniff

timer

RSSI settling

time before

valid carrier

sense

��

242��_��

1 µs -

473 µs

235 µs -

120 ms

��

∗ ��_��_��

FAST_RX_TIMER : register 0x54

Notes:

(1)The LDC timer can be scaled by 1, 2, 4 or 8.

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