DS28E01-100+ Maxim Integrated, DS28E01-100+ Datasheet - Page 12

• Manufacturer Part Number: DS28E01-100+
• Description: EEPROM
• Manufacturer: Maxim Integrated

1Kb Protected 1-Wire EEPROM
with SHA-1 Engine
DS28E01-100
Figure 9. Hardware Configuration
24
ABRIDGED DATA SHEET
Rx
Tx
BUS MASTER
OPEN-DRAIN
PORT PIN
Tx = TRANSMIT
Rx = RECEIVE
V
PUP
R
PUP
The 1-Wire bus is a system that has a single bus master
and one or more slaves. In all instances the DS28E01-
100 is a slave device. The bus master is typically a
microcontroller. The discussion of this bus system is
broken down into three topics: hardware configuration,
transaction sequence, and 1-Wire signaling (signal
types and timing). The 1-Wire protocol defines bus
transactions in terms of the bus state during specific
time slots, which are initiated on the falling edge of
sync pulses from the bus master.
The 1-Wire bus has only a single line by definition; it is
important that each device on the bus be able to drive
it at the appropriate time. To facilitate this, each device
attached to the 1-Wire bus must have open-drain or
three-state outputs. The 1-Wire port of the DS28E01-
100 is open drain with an internal circuit equivalent to
that shown in Figure 9.
A multidrop bus consists of a 1-Wire bus with multiple
slaves attached. The DS28E01-100 supports both a
standard and overdrive communication speed of
15.3kbps (max) and 90.9kbps (max), respectively. Note
DATA
I
L
DS28E01-100 1-Wire PORT
Hardware Configuration
100Ω MOSFET
1-Wire Bus System
Rx
Tx
Maxim Integrated