1
Features
·
Single Package Fully-integrated ROM Mask 4-bit Microcontroller with RF Transmitter
·
Low Power Consumption in Sleep Mode (< 1 µA Typically)
·
Maximum Output Power (10 dBm) with Low Supply Current (9.5 mA Typically)
·
2.0 V to 4.0 V Operation Voltage for Single Li-cell Power Supply
·
-40
°
C to +125
°
C Operation Temperature
·
SSO24 Package
·
About Seven External Components
·
Flash Controller for Application Program Available
Description
The ATAR862-4 is a single package triple-chip circuit. It combines a UHF ASK/FSK
transmitter with a 4-bit microcontroller and a 512-bit EEPROM. It supports highly inte-
grated solutions in car access and tire pressure monitoring applications, as well as
manifold applications in the industrial and consumer segment. It is available for the
frequency range of 429 MHz to 439 MHz with data rates up to 32 kbaud.
For further frequency ranges such as 310 MHz to 330 MHz and 868 MHz to 928 MHz
separate data sheets are available.
The device contains a ROM mask version microcontroller and an additional data
EEPROM.
Figure 1. Application Diagram
Antenna
Micro-
controller
PLL-
Transmitter
ATAR862-4
Keys
UHF ASK/FSK
Receiver
Micro-
controller
Microcontroller
with UHF
ASK/FSK
Transmitter
ATAR862-4
Preliminary
Rev. 4552B4BMCU02/03
3
ATAR862-4
4552B4BMCU02/03
21
CLK
Clock output signal for microcontroller
The clock output frequency is set by the
crystal to f
XTAL
/4
22
PA_ENABLE
Switches on power amplifier, used for
ASK modulation
23
24
ANT2
ANT1
Emitter of antenna output stage
Open collector antenna output
Pin Description: RF Part (Continued)
Pin
Symbol
Function
Configuration
CLK
VS
100
100
PA_ENABLE
50k
Uref=1.1V
20 mA
ANT1
ANT2
Pin Description: Microcontroller Part
Name
Type
Function
Alternate Function
Pin-No.
Reset State
V
DD
Supply voltage
13
NA
V
SS
Circuit ground
12
NA
BP20
I/O
Bi-directional I/O line of Port 2.0
NTE-test mode enable, see also section "Master Reset"
7
Input
BP40
I/O
Bi-directional I/O line of Port 4.0
SC-serial clock or INT3 external interrupt input
14
Input
BP41
I/O
Bi-directional I/O line of Port 4.1
VMI voltage monitor input or T2I external clock input
Timer 2
9
Input
BP42
I/O
Bi-directional I/O line of Port 4.2
T2O Timer 2 output
10
Input
BP43
I/O
Bi-directional I/O line of Port 4.3
SD serial data I/O or INT3-external interrupt input
11
Input
BP50
I/O
Bi-directional I/O line of Port 5.0
INT6 external interrupt input
17
Input
BP52
I/O
Bi-directional I/O line of Port 5.2
INT1 external interrupt input
16
Input
BP53
I/O
Bi-directional I/O line of Port 5.3
INT1 external interrupt input
15
Input
BP60
I/O
Bi-directional I/O line of Port 6.0
T3O Timer 3 output
20
Input
BP63
I/O
Bi-directional I/O line of Port 6.3
T3I Timer 3 input
6
Input
OSC1
I
Oscillator input
4-MHz crystal input or 32-kHz crystal input or external
clock input or external trimming resistor input
18
Input
OSC2
O
Oscillator output
4-MHz crystal output or 32-kHz crystal output or external
clock input
19
Input
NRESET
I/O
Bi-directional reset pin
5
I/O
4
ATAR862-4
4552B4BMCU02/03
UHF ASK/FSK Transmitter Block
Features
·
Integrated PLL Loop Filter
·
ESD Protection (4 kV HBM/200 V MM, Except Pin 2: 4 kV HBM/100 V MM) also at ANT1/ANT2
·
Maximum Output Power (10 dBm) with Low Supply Current (9.5 mA Typically)
·
Modulation Scheme ASK/FSK
FSK Modulation is Achieved by Connecting an Additional Capacitor between the XTAL Load Capacitor and the Open-
drain Output of the Modulating Microcontroller
·
Easy to Design-in Due to Excellent Isolation of the PLL from the PA and Power Supply
·
Supply Voltage 2.0 V to 4.0 V in the Temperature Range of -40
°
C to +125
°
C
·
Single-ended Antenna Output with High Efficient Power Amplifier
·
External CLK Output for Clocking the Microcontroller
·
125
°
C Operation for Tire Pressure Systems
Description
The PLL transmitter block has been developed for the demands of RF low-cost transmission systems, at data rates up to
32 kbaud. The transmitting frequency range is 429 MHz to 439 MHz. It can be used in both FSK and ASK systems.
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