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參數(shù)資料
| 型號： | CYM1821 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | 16K x 32 Static RAM Module(16K x 32 靜態(tài)RAM模塊) |
| 中文描述： | 16K的× 32靜態(tài)RAM模塊（16K的× 32靜態(tài)RAM的模塊） |
| 文件頁數(shù)： | 2/15頁 |
| 文件大小： | 114K |
| 代理商： | CYM1821 |
1–WIREAND
CONTROL LOGIC
TEMPERATURE SENSOR
SENSE
V
DD
HIGH TEMP TRIGGER, TH
LOW TEMP TRIGGER, TL
DIGITAL COMPARATOR/LOGIC
GND
DQ
DS1821
062498 2/15
DETAILED PIN DESCRIPTION
PIN
PR35
PIN
TO–220
PIN
8–PIN
SOIC
SYMBOL
DESCRIPTION
1
2/TAB
2
GND
Ground
.
Data input/output pin
for 1–Wire
TM
programming operation;
Thermostat output pin
in normal operation.
2
3
1
DQ
3
1
8
V
DD
V
DD
pin. +5V nominal.
DS1821S (8–pin SOIC): All pins not specified in this table are not to be connected.
OVERVIEW
The block diagram of Figure 1 shows the major compo-
nents of the DS1821. The DS1821 has two operating
modes: 1–Wire
TM
and thermostat.
The part arrives from the factory in 1–Wire mode. In this
mode, the DQ pin of the DS1821 is configured as a
1–Wire communication port which would be connected
to a microprocessor. The microprocessor will write data
into the high and low temperature trigger registers, TH
and TL, respectively, to set up the temperature limits for
thermostat operation. In this mode, the result of the last
temperature measurement made by the DS1821 may
also be read directly by the microprocessor.
Once temperature limits have been set and thermome-
ter operation has been verified, the user may convert
the DS1821 from a temperature sensor into a thermo-
stat by writing to a bit in the status register. The part will
then be configured for thermostat operation; this will
also become the default power–up state for the device
on the subsequent power up.
In thermostat mode, the DQ line becomes the thermo-
stat output. This open drain output will go to its active
state (programmable on/off) when the temperature of
the DS1821 goes above the limit set in the TH register,
and will remain active until the temperature goes below
the limit programmed into the TL register.
If the user wishes to establish communications with the
DS1821 once it has been placed in thermostat mode
(for example, to change temperature trip point limits),
this may be done by dropping V
DD
while holding the DQ
line high, then clocking the DQ line 16 times. The part
will then be placed into 1–Wire mode, and will allow the
I/O functions of the device to operate, and reads from or
writes to the memory are possible. This does not
change the power up state of the device, unless the user
writes the configuration bit to do so.
DS1821 BLOCK DIAGRAM
Figure 1
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