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): 6/15頁
文件大小: 114K
代理商: CYM1821
DS1821
062498 6/15
Example: CPU sets up DS1821 for low temp limit of +10
°
C and high temp limit of +40
°
C, output active high (i.e., DQ pin
is off), then instructs the DS1821 to become a thermostat.
DQ PORT PIN
DATA (LSB
FIRST)
COMMENTS
TX
Reset
Reset pulse (480–960
μ
s).
RX
Presence
Presence pulse.
TX
01h
CPU issues Write TH command.
TX
28h
CPU sends data for TH limit of +40
°
C.
TX
Reset
Reset pulse (480–960
μ
s).
RX
Presence
Presence pulse.
TX
02h
CPU issues Write TL command.
TX
0Ah
CPU sends data for TL limit of +10
°
C.
TX
Reset
Reset pulse (480–960
μ
s).
RX
Presence
Presence pulse.
TX
A1h
CPU issues Read TH command.
RX
28h
DS1821 sends back stored value of TH for CPU to verify.
TX
Reset
Reset pulse (480–960
μ
s).
RX
Presence
Presence pulse.
TX
A2h
CPU issues Read TL command.
RX
0Ah
DS1821 sends back stored value of TL for CPU to verify.
TX
Reset
Reset pulse (480–960
μ
s).
RX
Presence
Presence pulse.
TX
0Ch
CPU issues Write Config command.
TX
06h
CPU sets DS1821 up for active high output, sets T/R bit to instruct
device to become thermostat.
<high imped-
ance>
Power cycles; DS1821 now comes up in thermostat mode.
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