TCN75-3.3MPA TELCOM [TelCom Semiconductor, Inc], TCN75-3.3MPA Datasheet - Page 3

• Manufacturer Part Number: TCN75-3.3MPA
• Description: 2-WIRE SERIAL TEMPERATURE SENSOR AND THERMAL MONITOR
• Manufacturer: TELCOM [TelCom Semiconductor, Inc]

2-WIRE SERIAL TEMPERATURE
SENSOR AND THERMAL MONITOR
SERIAL PORT TIMING (Cont.):
Symbol
t
t
t
t
t
NOTES: 1. Output current should be minimized for best temperature accuracy. Power dissipation within the TCN75 will cause self-heating and
DETAILED DESCRIPTION
Figure 1.
Serial Data (SDA)
using this pin.
Serial Clock (SCL)
INT/CMPTR
Mode, unconditionally driven active any time temperature
exceeds the value programmed into the T
CMPTR will become inactive when temperature subse-
quently falls below the T
Programmer's Model. ) In Interrupt Mode, INT/CMPTR is
also made active by TEMP exceeding T
ally reset to its inactive state by reading any register via the
2-wire bus. If and when temperature falls below T
CMPTR is again driven active. Reading any register will
clear the T
TCN75-04 6/16/97
H(START)
DSU
DH
SU(STOP)
IDLE
PIN DESCRIPTION
Pin Number
A typical TCN75 hardware connection is shown in
Bidirectional. Serial data is transferred in both directions
Input. Clocks data into and out of the TCN75.
Open Collector, Programmable Polarity. In Comparator
1
2
3
4
5
6
7
8
2. All part types of the TCN75 will operate properly over the wider power supply range of 2.7V to 5.5V. Each part type is tested and specified
3. Human body model, 100pF discharged through a 1.5k resistor, machine model, 200pF discharged directly into each pin.
HYST
temperature drift. At maximum rated output current and saturation voltage, 4mA and 0.8V, respectively, the error amounts to 0.352 C for the
PDIP, and 0.544 C for the SOIC.
for rated accuracy at its nominal supply voltage. As V
Parameter
Start Condition Hold Time
Data in Setup Time to SCL High
Data in Hold Time after SCL Low
Stop Condition Setup Time
Bus Free Time Prior to New
Transition
interrupt. In Interrupt Mode, the INT/CMPTR
INT/CMPTR
Symbol
GND
SDA
SCL
V
A
A
A
DD
2
1
0
HYST
setting. (See Register Set and
Description
Bidirectional Serial Data.
Serial Data Clock Input.
Interrupt or Comparator Output.
System Ground.
Address Select Pin (MSB).
Address Select Pin.
Address Select Pin (LSB).
Power Supply Input.
SET
noted.
2.7V
SET
; it is uncondition-
register. INT/
Test Conditions
V
DD
HYST
5.5V; – 55 C
, INT/
DD
varies from the nominal value, accuracy will degrade 1 C/V of V
3
output is unconditionally reset upon entering Shutdown
Mode. If programmed as an active-low output, it can be
wire-ORed with any number of other open collector devices.
Most systems will require a pull-up resistor for this configu-
ration.
causes power dissipation and may cause internal heating of
the TCN75. To avoid affecting the accuracy of ambient
temperature readings, the pull-up resistor should be made
as large as possible. INT/CMPTR's output polarity may be
programmed by writing to the INT/CMPTR POLARITY bit in
the CONFIG register. The default is active low.
Address (A2, A1, A0)
8-bit address. A match between the TCN75's address and
the address specified in the serial bit stream must be made
to initiate communication with the TCN75. Many protocol-
compatible devices with other addresses may share the
same 2-wire bus.
Slave Address
A5, A4, A3) are fixed to 1001[B]. The states of A2, A1 and
Note that current sourced from the pull-up resistor
Inputs. Sets the three least significant bits of the TCN75
The four most significant bits of the Address Byte (A6,
(T
A
= T
J
)
125 C, C
PRELIMINARY INFORMATION
1250
1250
1250
Min
100
0
L
= 80pf, unless otherwise
Typ
—
—
—
—
—
Max
—
—
—
—
—
DD
change.
TCN75
Unit
nsec
nsec
nsec
nsec
nsec