1322XUSB Freescale Semiconductor, 1322XUSB Datasheet - Page 15

• Manufacturer Part Number: 1322XUSB
• Description: KIT USB 1322X
• Manufacturer: Freescale Semiconductor
• Type: Transceiverr

Specifications of 1322XUSB

• Frequency: 2.4GHz
• Wireless Frequency: 2.4 GHz
• Interface Type: USB
• Security: 128 bit AES
• Operating Voltage: 2 V to 3.6 V
• Operating Temperature Range: - 40 C to + 105 C
• Silicon Manufacturer: Freescale
• Silicon Core Number: MC13224
• Kit Application Type: Communication & Networking
• Application Sub Type: ZigBee
• Kit Contents: USB Stick, IAR Software
• Rohs Compliant: Yes
• For Use With/related Products: MC1322x
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.3.4
An optional feature of the ADC module is a battery voltage monitor capability. An onboard 1.2 Vdc
reference voltage can be sampled by the ADC module. The battery-sourced supply voltage is used as the
high reference voltage for the ADC and as the supply voltage lowers due to battery usage, the onboard
reference voltage reading will become greater because this fixed voltage is a higher percentage of the
reduced supply voltage.
Programmable high and low thresholds are provided for an ADC analog sample channel to monitor the
reference voltage. This feature can be used as a trigger to provide low battery indication, protection for
data that may be lost due to end-of-life for the battery, monitoring charging, and controlling buck regulator
operation.
3.4
The MC1322x provides acceleration hardware for IEEE 802.15.4 applications and this hardware includes
802.15.4 MAC acceleration and AES encryption/decryption.
3.4.1
The MC1322x contains a hardware block that provides a low-level MAC and PHY link controller, which
together with software running on the ARM core, implements the baseband protocols and other low-level
link routine control and link control. Components of the MACA include a sequencer/controller (with
timers), TX and RX packet buffers, DMA block, frame check sequence (FCS) generator/checker, and
control registers.
As part of the 802.15.4 protocol, packets are generated and transmitted, packets are received and verified,
and channel energy is measured via a clear channel assessment (CCA). Also, combinations or sequences
of events are required as part of the protocol such as an ACK response following a received packet. The
MACA facilitates these activities via control of the transceiver and off loads the functions from the CPU.
A dedicated DMA function moves data between the MACA buffers and RAM on a cycle steal basis and
does not require intervention from the CPU.
Freescale Semiconductor
IEEE 802.15.4 Acceleration Hardware
Battery
802.15.4 MAC Accelerator (MACA) Overview
LR EG_BK_F B
Normal Operation
COIL_BK
Figure 5
VBATT
Voltage Monitor
shows a MACA simplified block diagram.
NC
VDD
Figure 4. Optional Buck Regulator
MC1322x Technical Data, Rev. 1.3
Buck Regulator Enabled
LREG_BK_F B
COIL_BK
VBATT
VDD
D1
DIODE SCHOTTKY
L2
100uH
C2
10uF
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