Complies with Directive 2002/95/EC (RoHS)
Product Overview
TXC101 is a highly integrated single chip, multi-channel, low power, high
data rate RF transmitter designed to operate in the unlicensed 315/433/868
and 915 MHz frequency bands. All critical RF and baseband functions are
completely integrated in the chip, thus minimizing external component
count and simplifying design-ins. Its small size with low power
consumption makes it ideal for various short range radio applications.
The TXC101 is a dual mode solution. In the Micro controller mode, a
generic 10MHz crystal and a low-cost microcontroller are the only
requirements to create a complete Transmitter link.
In the EEPROM mode, the TXC101 can function as a complete data
transmitter with any SPI compatible EEPROM and does not need a micro
controller. This makes it an ideal solution for a variety of simple short
range radio applications.
16-TSSOP package
Popular applications
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Remote control applications
Active RFID tags
Wireless PC Peripherals
Automated Meter reading
Home & Industrial Automation
Security systems
Remote keyless entry
Automobile Immobilizers
Sports & Performance monitoring
Wireless Toys
Medical equipment
Low power two way telemetry systems
Wireless mesh sensors
Wireless modules
Key Features
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Modulation: OOK/FSK
Frequency Hopping Spread Spectrum capability
Operating frequency: 315/433/868/915 MHz
Low current consumption (TX current ~ 10mA)
Wide Operating supply voltage: 2.2 to 5.4V
Low standby current (0.2uA)
OOK Data rate up to 512kbps
FSK Data rate up to 256kbps
Support for Multiple Channels
[315/433 Bands]: 380 Channels (25kHz)
[868 Band]: 761 Channels (25kHz)
[915 Band]: 1040 Channels (25kHz)
Generic 10MHz Xtal reference
Processor or EEPROM Mode Operation
Integrated PLL, IF & Baseband Circuitry
Programmable Push Button Control
Programmable Output RF Power
Programmable, Positive/Negative FSK Deviation
Programmable Clock Output Frequency
Standard SPI interface
Integrated, Programmable Low Battery Voltage Detector
External Wake-up Events
TTL/CMOS Compatible I/O pins
Automatic Antenna tuning circuit
Very few external components requirement
No Manual Adjustment Needed for Production
Small size plastic package: 16-pin TSSOP
Standard 13 inch reel, 2000 pieces.
RF Monolithics, Inc.
4441 Sigma Road
Dallas, Texas 75244
(800) 704-6079 toll-free in U.S. and Canada
www.rfm.com
Email: info@rfm.com
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Table of Contents
Table of Contents
.......................................................................................................... 2
1.0 Pin Descriptions
...................................................................................................... 3
1.1 Processor Mode Pin Configuration
.................................................................. 3
1.2 EEPROM Mode Pin Configuration
.................................................................... 4
2.0 Functional Description
........................................................................................... 5
2.1 TXC101 Processor Mode Application
.............................................................. 5
RF Transmitter Matching ..................................................................................... 5
Antenna Design Considerations........................................................................... 6
PCB Layout Considerations ................................................................................. 6
2.2 EEPROM Mode Application...............................................................................
8
3.0 TXC101 Functional Characteristics
..................................................................... 11
Output Amplifier ....................................................................................................... 11
Frequency Control (PLL) and Frequency Synthesizer ............................................. 11
Transmit Register..................................................................................................... 11
Crystal Oscillator...................................................................................................... 12
Wake-Up Mode ........................................................................................................ 12
Low Battery Detector ............................................................................................... 12
Key Switch Inputs .................................................................................................... 12
SPI Interface ............................................................................................................ 13
4.0 Control and Configuration Registers
.................................................................. 14
Table of Control and Configuration Registers .......................................................... 14
Status Register ........................................................................................................ 15
Configuration Register [POR=8080h] ...................................................................... 16
Transmit Power Configuration Register [POR=B0h] ................................................ 18
Transmit Command Register ................................................................................... 19
Frequency Setting Register [POR=A7D0h].............................................................. 20
Data Rate Setup Register [POR=C800h]................................................................. 21
Button Command Register [POR=CA00h] ............................................................... 22
Sleep/Clock Command Register [POR=C400h]....................................................... 23
Wake-up Timer Period Register [POR=E000h]........................................................ 24
Battery Detect Threshold Register [POR=C200h].................................................... 25
Power Management Register [POR=C000h] ........................................................... 26
5.0 Maximum Ratings..................................................................................................
27
Recommended Operating Ratings........................................................................... 27
6.0 DC Electrical Characteristics
............................................................................... 27
7.0 AC Electrical Characteristics
............................................................................... 28
8.0 Package Information
............................................................................................. 30
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1.0 Pin Description
Processor Mode
Pin
1
2
3
4
5
6
7
8
Name
SDI
SCK
nCS
SW1
SW2
SW3
SW4
ClkOut
Description
SPI Data In
SPI Data Clock
Chip Select Input–
Selects the chip for an SPI data transaction. The pin must be pulled
‘low’ for a 16-bit read or write function. See Figure 4 for timing specifications.
Switch
or Push Button Input 1 with Internal pull-up resistor
Switch
or Push Button Input 2 with Internal pull-up resistor
Switch
or Push Button Input 3 with Internal pull-up resistor
Switch
or Push Button Input 4 with Internal pull-up resistor
Optional host processor Clock Output
Xtal
- Connects to a 10MHz series crystal or an external oscillator reference.
The circuit
contains an integrated load capacitor (See
Configuration Register)
in order to minimize
the external component count. The crystal is used as the reference for the PLL, which
generates the local oscillator frequency. The accuracy requirements for production
tolerance, temperature drift and aging can be determined from the maximum allowable
local oscillator frequency error. Whenever a low frequency error is essential for the
application, it is possible to “pull” the crystal to the accurate frequency by changing the
load capacitor value.
Ext Ref
– An external reference, such as an oscillator, may be connected as a reference
source. Connect through a .01uF capacitor.
System Ground
Mode Select –
Connect to VDD for Processor Mode.
RF Diff I/O
RF Diff I/O
Interrupt Request
– Interrupt Request Output and Status Register Data Read Output.
Supply Voltage
Modulation Input
– Serial data input for FSK or OOK modulation
9
Xtal/Ref
10
11
12
13
14
15
16
GND
MODE
RF_P
RF_N
nIRQ
VDD
MOD
1.1 Processor Mode Pin Configuration
TOP VIEW
SDI
SCK
nCS
SW1
SW2
SW3
SW4
CLKOUT
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
TXC101
MOD
VDD
nIRQ
RF_N
RF_P
MODE
GND
Xtal/Ref
3
EEPROM Mode
Pin
1
2
3
4
5
6
7
8
Name
SDI
SCK
nCS
SW1
SW2
SW3
SW4
SDO
Description
SPI Data In
SPI Data Clock
Chip Select Input -
Selects the chip for an SPI data transaction. The pin must be pulled
‘low’ for a 16-bit read or write function. See Figure 4 for timing specifications.
Switch
or Push Button Input 1 with Internal pull-up resistor
Switch
or Push Button Input 2 with Internal pull-up resistor
Switch
or Push Button Input 3 with Internal pull-up resistor
Switch
or Push Button Input 4 with Internal pull-up resistor
SPI Data Out
Xtal
- Connects to a 10MHz series crystal or an external oscillator reference.
The circuit
contains an integrated load capacitor (See
Configuration Register)
in order to minimize
the external component count. The crystal is used as the reference for the PLL, which
generates the local oscillator frequency. The accuracy requirements for production
tolerance, temperature drift and aging can be determined from the maximum allowable
local oscillator frequency error. Whenever a low frequency error is essential for the
application, it is possible to “pull” the crystal to the accurate frequency by changing the
load capacitor value.
Ext Ref
– An external reference, such as an oscillator, may be connected as a reference
source. Connect through a .01uF capacitor.
System Ground
Mode Select –
Connect to GND for EEPROM Mode.
RF Diff I/O
RF Diff I/O
Low Battery Detect
– When the battery voltage falls below the programmed level this
output goes “low”. The voltage level is programmable through the
Battery Detect
Threshold Register.
Supply Voltage
Not used.
Tie to VDD or GND
9
Xtal/Ref
10
11
12
13
14
15
16
GND
MODE
RF_P
RF_N
nBD
VDD
NC
1.2 EEPROM Mode Pin Configuration
TOP VIEW
SDI
SCK
nCS
SW1
SW2
SW3
SW4
SDO
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
TXC101
NC
VDD
nBD
RF_N
RF_P
MODE
GND
Xtal/Ref
4
2.0 Functional Description
The TXC101 is a low power, frequency agile, multi-channel OOK/FSK transmitter for use in the 315, 433,
868, and 916 MHz bands. All RF transmit functions are completely integrated requiring only a single
10MHz crystal as a reference source. The TXC101 has two modes of operation: EEPROM mode and
Processor mode. EEPROM mode is fully compatible with any standard SPI interface EEPROM.
Functions include:
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PLL synthesizer
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Power Amp
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Crystal oscillator
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Sleep Timer
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OOK/FSK Modulation
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4 Key/Switch Functions
The TXC101 is ideal for Frequency Hopping Spread Spectrum (FHSS) applications requiring frequency
agility to meet FCC and ETSI requirements. Use of a low-cost microcontroller or SPI compatible
EEPROM is all that is needed to create a complete transmitter. The TXC101 also incorporates different
sleep modes to reduce overall current consumption and extend transmitter battery life. It is ideal for
applications operating from typical lithium coin cells.
2.1 TXC101 Processor Mode and Application Circuit
Figure 1. Typical Processor Mode Application Circuit for 50 Ohm Load
The TXC101 may be used with a typical low-cost microcontroller. All internal functions are accessible
through the SPI interface. Figure 1 shows a typical connection for using a microcontroller to control the
TXC101 functions.
RF Transmitter Matching
The RF pins are high impedance and differential. The optimum differential load for the RF port at a given
frequency band is shown in Table 1.
TABLE 1.
Admittance [S] Impedance [Ohm] Lantenna (nH)
9.4e-4 – j4.5e-3
43 + j214
112
315 MHz
21 + j157
59
433 MHz
8.4e-4 – j6.25e-3
7.9 + j83
15.3
868 MHz
1.15e-3 – j1.2e-2
7.6 + j79
13.9
916 MHz
1.2e-3 – j1.25e-2
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