T48C862M-R3-TNQ Atmel, T48C862M-R3-TNQ Datasheet - Page 34

• Manufacturer Part Number: T48C862M-R3-TNQ
• Description: IC MON TIRE PRESS 315MHZ 24SOIC
• Manufacturer: Atmel

Specifications of T48C862M-R3-TNQ

• Frequency: 315MHz
• 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: -

Bi-directional Port 2
34
T48C862-R3
Figure 28. Bi-directional Port 1
As all other bi-directional ports, this port includes a bitwise programmable Control Reg-
ister (P2CR), which enables the individual programming of each port bit as input or
output. It also opens up the possibility of reading the pin condition when in output mode.
This is a useful feature for self testing and for serial bus applications.
Port 2, however, has an increased drive capability and an additional low resistance
pull-up/pull-down transistor mask option.
Care should be taken connecting external components to BP20/NTE. During any reset
phase, the BP20/NTE input is driven towards V
transistor. This pin must not be pulled down (active or passive) to V
any external circuitry representing a resistor of less than 150 kW. This prevents the cir-
cuit from unintended switching to test mode enable through the application circuitry at
pin BP20/NTE. Resistors less than 150 kW might lead to an undefined state of the inter-
nal test logic thus disabling the application firmware.
To avoid any conflict with the optional internal pull-down transistors, BP20 handles the
pull-down options in a different way than all other ports. BP20 is the only port that
switches off the pull-down transistors during reset.
Figure 29. Bi-directional Port 2
Master reset
OUT
IN
I/O Bus
I/O Bus
I/O Bus
Master reset
I/O Bus
(Direction)
(Data out)
P2DATy
D
D
P2CRy
S
S
(Direction)
Q
Q
(Data out)
P1DATy
D
S
R
Reset
R
NQ
Q
Q
*
Configurable
*) Configurable
DD
by an additional internal strong pull-up
*
*
*
*
* *
Switched
pull-up
Switched
Switched
pull-down
*
*
pull-up
V DD
V
Switched
pull-down
*
DD
*
V DD
SS
*
*
4554A–4BMCU–02/03
BP2y
during reset by
Static
Pull-up
Static
Pull-down
V
DD
BP1y
Static
pull-up
Static
pull-down