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DS2432 Datasheet(PDF) 11 Page - Dallas Semiconductor

Part # DS2432
Description  1k-Bit Protected 1-Wire EEPROM with SHA-1 Engine
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Manufacturer  DALLAS [Dallas Semiconductor]
Direct Link  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS2432 Datasheet(HTML) 11 Page - Dallas Semiconductor

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PRELIMINARY
DS2432
11 of 30
Memory and SHA Functions Flow Chart (continued) Figure 7
33h
Compute Next
Secret ?
Valid Data
Address ?
Y
N
Bus Master TX
TA1 (T7:T0),
TA2 (T15:T8)
Y
Bus Master
RX “1”s
Master
TX Reset ?
Y
N
*
1-Wire idle high for power
Note: The master must first
load the scratchpad with a
partial secret of 8 bytes
From Figure 7
3
rd Part
To Figure 7
3
rd Part
From Figure 7
5
th Part
To Figure 7
5
th Part
N
N
SHA Engine Computes Message
Authentication Code of Current
Secret, Page Data, and 8 Byte
Partial Secret in Scratchpad
DS2432 Copies a Partial MAC
to the Secret Register
Master
TX Reset ?
Master
TX Reset ?
Y
N
DS2432 TX “1”
DS2432 TX “0”
N
Y
DS2432 fills Scratchpad with AAh
*
*
Write-
Protected ?
Y


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