DS1992/DS1993
Figure 6. MEMORY FUNCTIONS FLOW CHART
Master TX Memory
Function Command
0FH
Write
Scratchpad
?
Y
N
AAH
Read
Scratchpad
?
Y
To Figure 6
Second Part
Bus Master TX
TA1 (T7:T0)
Bus Master TX
TA2 (T15:T8)
DS199x sets Scratchpad
Offset = (T4:T0) and
Clears (PF, OF, AA)
Master TX Data Byte
To Scratchpad Offset
DS199x sets (E4:E0)
= Scratchpad Offset
Bus Master RX
TA1 (T7:T0)
Bus Master RX
TA2 (T15:T8)
Master RX Ending
Offset with Data
Status (E/S)
DS199x Sets
Scratchpad
Offset=(T4:T0)
Master RX Data
Byte From
Scratchpad Offset
Y
DS199x Increments
Scratchpad Offset
N
Bus Master
TX Reset
?
N
Scratch-
pad Offset =
11111b ?
Y
Y
DS199x Increments
Scratchpad Offset
N
Partial
Byte Written
?
Bus Master
TX Reset
?
N
Scratch-
pad Offset =
11111b ?
Y
Y
Y
OF = 1
Bus Master
TX Data
?
N
N
PF = 1
Bus Master
RX "1"s
N
Bus Master
TX Reset
?
Y
7 of 17
DS199x TX
Presence Pulse
(See Figure 9)
From Figure 6
Second Part
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相关代理商/技术参数
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DS1994 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:4kb Plus Time Memory iButton
DS1994-LF5 制造商: 功能描述: 制造商:undefined 功能描述:
DS1994L-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
DS1994L-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
DS1994L-F5-W 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
DS1994-LFS 制造商: 功能描述: 制造商:undefined 功能描述:
DS1995 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:16-kbit Memory iButton