MRF24J40-I/ML Microchip Technology, MRF24J40-I/ML Datasheet - Page 125

• Manufacturer Part Number: MRF24J40-I/ML
• Description: IC TXRX IEEE/ZIGBEE 2.4GHZ 40QFN
• Manufacturer: Microchip Technology

Specifications of MRF24J40-I/ML

• Package / Case: 40-QFN
• Frequency: 2.4GHz
• Data Rate - Maximum: 250kbps
• Modulation Or Protocol: 802.15.4
• Applications: ISM, ZigBee™
• Power - Output: 0dBm
• Sensitivity: -95dBm
• Voltage - Supply: 2.4 V ~ 3.6 V
• Current - Receiving: 18mA
• Current - Transmitting: 18mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Number Of Receivers: 1
• Number Of Transmitters: 1
• Wireless Frequency: 2.4 GHz
• Interface Type: 4 Wire SPI
• Noise Figure: 8 dB
• Output Power: + 0 dBm
• Operating Supply Voltage: 2.5 V, 3.3 V
• Maximum Operating Temperature: 85 C
• Mounting Style: SMD/SMT
• Maximum Supply Current: 22 mA
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

3.15.2
In the Immediate Sleep and Wake-up mode, the host
microcontroller places the MRF24J40 to Sleep and
wakes it up.
To enable the Immediate Wake-up mode, set the
IMMWAKE (0x22<7>) bit to ‘1’.
To place the MRF24J40 to Sleep immediately, perform
the following two steps:
1.
2.
EXAMPLE 3-3:
© 2010 Microchip Technology Inc.
The steps to prepare the MRF24J40 for immediate sleep and wake up on WAKE pin
Prepare WAKE pin:
1. WAKE pin = low
2. RXFLUSH (0x0D) = 0x60 – Enable WAKE pin and set polarity to active-high
3. WAKECON (0x22) = 0x80 – Enable Immediate Wake-up mode
Put to Sleep:
4. SOFTRST (0x2A) = 0x04 – Perform a Power Management Reset
5. SLPACK (0x35) = 0x80 – Put MRF24J40 to Sleep immediately
To Wake:
6. WAKE pin = high – Wake-up
7. RFCTL (0x36) = 0x04 - RF State Machine reset
8. RFCTL (0x36) = 0x00
9. Delay 2 ms to allow 20 MHz main oscillator time to stabilize before transmitting or receiving.
Perform a Power Management Reset by setting
the RSTPWR (0x2A<2>) bit to ‘1’. The bit will be
automatically cleared to ‘0’ by hardware.
Put the MRF24J40 to Sleep immediately by set-
ting the SLPACK (0x35<7>) bit to ‘1’. The bit will
be automatically cleared to ‘0’ by hardware.
IMMEDIATE SLEEP AND WAKE-UP
MODE
IMMEDIATE SLEEP AND WAKE
Preliminary
Wake-up can be performed in one of two methods:
1.
or
2.
After wake-up, delay at least 2 ms to allow 20 MHz main
oscillator time to stabilize before transmitting or receiving.
Example 3-3 summarizes the steps to prepare the
MRF24J40 for wake-up on WAKE pin and placing to
Sleep.
Wake-up on WAKE pin 15. To enable the WAKE
pin, set the WAKEPAD (0x0D<5>) bit to ‘1’ and
set the WAKE pin polarity. Set the WAKEPOL
(0x0D<7>) bit to ‘1’ for active-high signal, or
clear to ‘0’ for active-low signal.
Wake-up on register. To wake up the MRF24J40
from Sleep via the SPI port, set the REGWAKE
(0x22<6>) bit to ‘1’ and then clear to ‘0’.
MRF24J40
DS39776C-page 125