DS1825 Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID
18 of 21
Figure 16. DETAILED MASTER READ 1 TIMING
Figure 17. RECOMMENDED MASTER READ 1 TIMING
DS1825 OPERATION EXAMPLE
In this example there are multiple DS1825s on the bus and they are using parasite power. The bus master initiates
a temperature conversion in a specific DS1825 and then reads its scratchpad and recalculates the CRC to verify
the data.
MASTER MODE
DATA (LSB FIRST)
COMMENTS
TX
Reset
Master issues reset pulse.
RX
Presence
DS1825s respond with presence pulse.
TX
F0h
Master issues Search ROM command and builds
Crossreference Table
TX
Reset
Master issues reset pulse.
RX
Presence
DS1825s respond with presence pulse.
TX
55h
Master issues Match ROM command for desired address
TX
64-bit ROM code
Master sends DS1825 ROM code.
TX
44h
Master issues Convert T command.
TX
DQ line held high by
strong pullup
Master applies strong pullup to DQ for the duration of the
conversion (t
conv
).
TX
Reset
Master issues reset pulse.
RX
Presence
DS1825s respond with presence pulse.
TX
55h
Master issues Match ROM command.
TX
64-bit ROM code
Master sends DS1825 ROM code.
TX
BEh
Master issues Read Scratchpad command.
RX
9 data bytes
Master reads entire scratchpad including CRC. The master
then recalculates the CRC of the first eight data bytes from the
scratchpad and compares the calculated CRC with the read
CRC (byte 9). If they match, the master continues; if not, the
read operation is repeated.
V
PU
GND
1-WIRE BUS
15 ms
IH of Master
T
RC
T
INT
> 1 ms
Master samples
LINE TYPE LEGEND
Bus master pulling low
Resistor pullup
V
PU
GND
1-WIRE BUS
15 ms
IH of Master
T
RC
=
small
T
INT
=
small
Master samples
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
DS1842N+T&R
IC CURRENT MONITOR 14TDFN
DS18B20+PAR
IC THERM MICROLAN PROG-RES TO-92
DS18B20Z/T&R
IC THERM MICROLAN PROG-RES 8SOIC
DS2740U+T&R
IC CURRENT GAUGE(15BIT) 8UMAX
DS28EA00U+T&R
IC THERMOMETER 1-WIRE 8-USOP
DS3920T-001+
IC CURRENT MIRROR 5:1 SOT23-6
DS4560LS-LO+T
IC SWITCH HOT-PLUG 12V 8-SOIC
DS600U+T&R
IC SENSOR TEMP 8-USOP
相关代理商/技术参数
DS1825U+TR
制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID
DS1825UTR
制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID
DS1830
功能描述:监控电路 Reset Sequencer RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel
DS1830+
功能描述:监控电路 Reset Sequencer RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel
DS1830A
功能描述:监控电路 Reset Sequencer RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel
DS1830A+
功能描述:监控电路 Reset Sequencer RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel
DS1830AS
功能描述:监控电路 Reset Sequencer RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel
DS1830AS/T&R
制造商:Maxim Integrated Products 功能描述:3.3V RESET SEQUENCER 8P SOIC T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC SEQUENCER RESET PB 3.3V 8SOIC 制造商:Maxim Integrated Products 功能描述:Supervisory Circuits Reset Sequencer