LLCC68 datasheet(62/106 Pages) SEMTECH

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LLCC68

Data Sheet

Rev. 1.0

DS.LLCC68.W.APP

July 2019

62 of 106

Semtech

www.semtech.com

13. Commands Interface

13.1 Operational Modes Functions

13.1.1 SetSleep

The command SetSleep(...) is used to set the device in SLEEP mode with the lowest current consumption possible. This

command can be sent only while in STDBY mode (STDBY_RC or STDBY_XOSC). After the rising edge of NSS, all blocks are

switched OFF except the backup regulator if needed and the blocks specified in the parameter sleepConfig.

The sleepConfig argument is defined in Table 13-2.

When entering SLEEP mode, the BUSY line is asserted high and stays high for the duration of the SLEEP period.

Once in SLEEP mode, it is possible to wake the device up from the host processor with a falling edge on the NSS line. The

device can also wake up automatically based on a counter event driven by the RTC 64 kHz clock. If the RTC is used, a rising

edge of NSS will still wake up the chip (the host keeps control of the chip).

By default, when entering into SLEEP mode, the chip configuration is lost. However, being able to store chip configuration

to lower host interaction or during RxDutyCycle mode can be implemented using the register in retention mode during

SLEEP state. This is available when the SetSleep(...) command is sent with sleepConfig[2] set to 1. Once the chip leaves SLEEP

mode (by NSS or RTC event), the chip will first restore the registers with the value stored into the retention register.

Caution:

Once the command SetSleep(...) has been sent, the device will become unresponsive for around 500

s, time needed for the

configuration saving process and proper switch off of the various blocks. The user must thus make sure the device will not

be receiving SPI command during these 500

s to ensure proper operations of the device.

Table 13-1: SetSleep SPI Transaction

Byte

Data from host

Opcode = 0x84

sleepConfig

Table 13-2: Sleep Mode Definition

SleepConfig[7:3]

SleepConfig [2]

SleepConfig [1]

SleepConfig [0]

RESERVED

0: cold start

0: RFU

0: RTC timeout disable

RESERVED

1: warm start

(device configuration in

retention) 1

1. Note that only configuration for the activated modem before going to sleep is retained. Configuration of the other modems is lost and must be

re-configured.

0: RFU

1: wake-up on RTC timeout

(RC64k)

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