EVAL-ADM1024EB ON Semiconductor, EVAL-ADM1024EB Datasheet - Page 10

• Manufacturer Part Number: EVAL-ADM1024EB
• Description: BOARD EVAL FOR ADM1024
• Manufacturer: ON Semiconductor

Specifications of EVAL-ADM1024EB

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

NOTES
Figure 10. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register
2. If the Address Pointer Register is known to be
1. Although it is possible to read a data byte from a
2. In Figure 10 to Figure 12, the serial bus address is
A read operation is then performed consisting of
the serial bus address, R/W bit set to 1, followed
by the data byte read from the data register. This is
shown in Figure 12.
already at the desired address, data can be read
data register without first writing to the Address
Pointer Register, if the Address Pointer Register is
already at the correct value, it is not possible to
write data to a register without writing to the
Address Pointer Register because the first data
byte of a write is always written to the Address
Pointer Register.
shown as the default value 01011(A1)(A0), where
A1 and A0 are set by the three−state ADD pin.
SDA
SCL
SDA
SCL
START BY
START BY
MASTER
MASTER
SDA
SCL
START BY
MASTER
1
0
1
0
1
0
1
1
Figure 12. Reading Data from a Previously Selected Register
SERIAL BUS ADDRESS BYTE
1
SERIAL BUS ADDRESS BYTE
Figure 11. Writing to the Address Pointer Register Only
0
0
SERIAL BUS ADDRESS BYTE
0
1
FRAME 1
1
FRAME 1
1
FRAME 1
1
1
1
SDA (CONTINUED)
SCL (CONTINUED)
A1
A1
A1
http://onsemi.com
A0
A0
A0
R/W
R/W
ADM1024
ACK. BY
ADM1024
ACK. BY
10
R/W
ADM1024
ACK. BY
9
Measurement Inputs
be configured to perform various functions by programming
the Channel Mode Register.
while Pins 15, 16, and 19 are dedicated analog input channels.
Their function is unaffected by the Channel Mode Register.
inputs, or as digital fan speed measurement inputs, by
programming Bits 0 and 1 of the Channel Mode Register.
V
9
CC
The ADM1024 has nine external measurement pins that can
Pins 13 and 14 are dedicated to temperature measurement,
Pins 5 and 6 can be individually programmed as analog
Bit 3 of the Channel Mode Register configures the internal
D7
1
9
D7
1
measurement range for either 3.3 V or 5.0 V.
D7
1
from the corresponding data register without first
writing to the Address Pointer Register, so
Figure 11 can be omitted.
D7
D6
1
D6
D6
ADDRESS POINTER REGISTER BYTE
D6
D5
D5
D5
ADDRESS POINTER REGISTER BYTE
DATA BYTE FROM ADM1024
D5
D4
D4
D4
DATA BYTE
FRAME 3
FRAME 2
FRAME 2
D4
D3
D3
D3
FRAME 2
D2
D3
D2
D2
D2
D1
D1
D1
D1
D0
D0
D0
BY MASTER
ADM1024
ACK. BY
ADM1024
ACK. BY
NO ACK.
D0
9
9
ADM1024
9
ACK. BY
9
STOP BY
MASTER
STOP BY
MASTER
STOP BY
MASTER