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DS1977
Figure 7-3 . MEMORY/CONTROL FUNCTION FLOW CHART
From Figure 7
2 nd Part
69h
Read Mem.
N
To Figure 7
4 th Part
[w/PW]
Y
Decision made
by DS1977
Master TX
TA1 (T7:T0), TA2 (T15:T8)
Master TX
64-Bits [Password]
DS1977 sets Memory
Address = (T15:T0)
Master Activates
Strong Pullup
NOTE : The strong pullup
must be activated within
40μs after the last bit of the
password is transmitted.
Pullup duration: see t SPUR
To continue reading the next
memory page, the strong
pullup must be activated
within 40μs after the last bit
of the CRC16 is read.
Password
Accepted?
N
Decision made
by Master
Y
Master RX Data Byte
from Memory Address or
Y
Strong pull-
up valid?
N
FFh if Password Address
Y
Master
TX Reset?
N
End of Page?
Y
Master RX CRC16 of
N
DS1977 Incre-
ments Address
Counter
See
Command, Address, Data
(1 st Pass); CRC16 of Data
(Subsequent Passes)
Note
Master Activates
Strong Pullup
Master TX
Reset
N
CRC OK?
DS1977 Incre-
ments Address
Counter
Y
End of
Memory?
Y
N
To Figure 7
2 nd Part
Master
TX Reset?
Y
N
13 of 29
Master RX "1"s
From Figure 7
4 th Part
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相关代理商/技术参数
DS1977-F5+ 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1981U-F3-1125+ 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1981U-F3-114C+ 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1981U-F5-1124+ 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1981U-F5-1126+ 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1981U-F5-1130+ 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1981U-F5-1136+ 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1981U-F5-1139+ 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated