T48C862M-R4-TNS Atmel, T48C862M-R4-TNS Datasheet - Page 22

• Manufacturer Part Number: T48C862M-R4-TNS
• Description: IC MON TIRE PRESS 433MHZ 24-SOIC
• Manufacturer: Atmel

Specifications of T48C862M-R4-TNS

• Frequency: 433MHz
• Modulation Or Protocol: FM, FSK
• Data Rate - Maximum: 32 kBaud
• Power - Output: 10dBm
• Current - Transmitting: 9.5mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Memory Size: 1KB EEPROM, 1KB RAM
• Voltage - Supply: 2 V ~ 4 V
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 24-SOIC (0.200", 5.30mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Applications: -

Watchdog Reset
External Clock Supervisor
Voltage Monitor
22
T48C862-R4 [Preliminary]
A power-on reset pulse is generated by a V
(1.7 V). A brown-out reset pulse is generated when V
age threshold. Two values for the brown-out voltage threshold are programmable via
the BOT bit in the SC register. When the controller runs in the upper supply voltage
range with a high system clock frequency, the high threshold must be used. When it
runs with a lower system clock frequency, the low threshold and a wider supply voltage
range may be chosen. For further details, see the electrical specification and the
SC register description for BOT programming.
Figure 16. Brown-out Detection
The watchdog’s function can be enabled at the WDC register and triggers a reset with
every watchdog counter overflow. To suppress the watchdog reset, the watchdog
counter must be regularly reset by reading the watchdog register address (CWD). The
CPU reacts in exactly the same manner as a reset stimulus from any of the above
sources.
The external input clock supervisor function can be enabled if the external input clock is
selected within the CM and SC registers of the clock module. The CPU reacts in exactly
the same manner as a reset stimulus from any of the above sources.
The voltage monitor consists of a comparator with internal voltage reference. It is used
to supervise the supply voltage or an external voltage at the VMI pin. The comparator for
the supply voltage has three internal programmable thresholds one lower threshold (2.2
V), one middle threshold (2.6 V) and one higher threshold (3.0 V). For external voltages
at the VMI pin, the comparator threshold is set to V
the supervised voltage is below (VMS = 0) or above (VMS = 1) this threshold. An inter-
rupt can be generated when the VMS bit is set or reset to detect a rising or falling slope.
A voltage monitor interrupt (INT7) is enabled when the interrupt mask bit (VIM) is reset
in the VMC register.
Reset
Reset
CPU
CPU
2.0 V
1.7 V
V
BOT = 1, low brown-out voltage threshold 1.7 V (is reset value).
BOT = 0, high brown-out voltage threshold 2.0 V.
DD
BOT = '1'
BOT = '0'
t
d
= 1.5 ms (typically)
t d
t d
DD
rise across the default BOT voltage level
BG
DD
= 1.3 V. The VMS bit indicates if
falls below the brown-out volt-
t d
4551C–4BMCU–01/04
t