MC13212 Freescale Semiconductor, MC13212 Datasheet - Page 66
![IC TXRX RF 2.4GHZ FLSH 32K 71LGA](/photos/14/22/142235/mc13212_sml.jpg)
MC13212
Manufacturer Part Number
MC13212
Description
IC TXRX RF 2.4GHZ FLSH 32K 71LGA
Manufacturer
Freescale Semiconductor
Series
MC1321xr
Datasheet
1.1321XCSK-BDM.pdf
(70 pages)
Specifications of MC13212
Frequency
2.4GHz
Data Rate - Maximum
250kbps
Modulation Or Protocol
802.15.4 Zigbee
Applications
General Purpose
Power - Output
3dBm
Sensitivity
-92dBm
Voltage - Supply
1.8 V ~ 3.6 V
Current - Receiving
42mA
Current - Transmitting
35mA
Data Interface
PCB, Surface Mount
Memory Size
32kB Flash, 2kB RAM
Antenna Connector
PCB, Surface Mount
Operating Temperature
-40°C ~ 85°C
Package / Case
71-LGA
Mounting Style
SMD/SMT
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MC13212
Manufacturer:
FREESCALE
Quantity:
20 000
Company:
Part Number:
MC13212R2
Manufacturer:
FREESCALE
Quantity:
340
7.3
Figure 35
printed copper F antenna is used for low cost. Only the RFIN port of the MC1321x is required because the
differential port is bi-directional and uses the on-chip T/R switch. Matching to near 50 Ohms is
accomplished with L1, L2, L3, and the traces on the PCB. A balun transforms the differential signal to
single-ended to interface with the F antenna.
The proper DC bias to the RFIN_x (PAO_x) pins is provided through the balun. The CT_Bias pin provides
the proper bias voltage point to the balun depending on operation, that is, CT_Bias is at VDDA voltage for
transmit and is at ground for receive. CT_Bias is switched between these two voltages based on the
operation. Capacitor C2 provides some high frequency bypass to the dc bias point. The L3/C1 network
provides a simple bandpass filter to limit out-of-band harmonics from the transmitter.
66
•
U1
MC1321x
RFIN_M
CT_Bias
RFIN_P
PAO_M
PAO_P
GPIO1
When the MCU is used in low power modes, be sure that all unused IO are programmed properly
for low power operation (typically best case is as outputs in the low state). The MC1321x is
commonly used with the Freescale MC9S08GT/GB 8-bit devices. For these MCUs:
— Use only STOP2 and STOP3 modes (not STOP1) with these devices where the GPIO states are
— As stated above all unused GPIO should be programmed as outputs low for lowest power and
— The MCU has IO signals that are not pinned-out on the package. These signals must also be
44
39
38
36
35
34
RF Single Port Application with an F Antenna
shows a typical single port RF application topology in which part count is minimized and a
retained. The MCU must retain control of the MC1321x IO during low power operation.
no floating inputs.
initialized (even though they cannot be used) to prevent floating inputs.
Passive component values can vary as a function of circuit board layout as
required to obtain best matching and RF performance.
L1
1.5nH
L4
1.5nH
Figure 35. RF Single Port Application with an F-Antenna
L2
3.9nH
MC13211/212/213 Technical Data, Rev. 1.8
C2
10pF
3
2
4
Z1
LDB212G4005C-001
1
5
6
NOTE
L3
3.9nH
C1
1.0pF
R2
0R
Not Mounted
R1
0R
Freescale Semiconductor
2
3
4
5
ANT1
F_Antenna
J1
SMA_edge_Receptacle_Female