Rev. 4551C4BMCU01/04
Features
Single Package Fully-integrated 4-bit Flash Microcontroller with RF Transmitter
Low Power Consumption in Sleep Mode (< 1 A 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
Description
The T48C862-R4 is a single package dual-chip circuit. It combines a UHF ASK/FSK
transmitter with a 4-bit microcontroller. It supports highly integrated 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 transmitting frequency
range of 429 MHz to 439 MHz with data rates up to 32 kbaud Manchester coded.
For further frequency ranges such as 310 MHz to 330 MHz and 868 MHz to 928 MHz
separate datasheets are available.
The device contains a flash microcontroller.
Figure 1. Application Diagram
Antenna
Micro-
controller
PLL-
Transmitter
T48C862
Keys
UHF ASK/FSK
Receiver
Micro-
controller
Microcontroller
with UHF
ASK/FSK
Transmitter
T48C862-R4
Preliminary
3
T48C862-R4 [Preliminary]
4551C4BMCU01/04
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
A
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 section "Master Reset" on
page 21
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
T48C862-R4 [Preliminary]
4551C4BMCU01/04
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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