MAX7501 Maxim, MAX7501 Datasheet - Page 5

• Manufacturer Part Number: MAX7501
• Description: Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection
• Manufacturer: Maxim

Table
Figure 1. Serial Bus Timing
From a software perspective, the MAX7500/MAX7501/
MAX7502 appear as a set of byte-wide registers that
contain temperature data, alarm threshold values, and
control bits. A standard I
interface reads temperature data and writes control bits
and alarm threshold data. Each device responds to its
own I
and A2. See
The MAX7500/MAX7501/MAX7502 employ four stan-
dard I
and receive byte (Figures 1, 2, and 3). The shorter
receive byte protocol allows quicker transfers, provided
that the correct data register was previously selected
MAX7500
MAX7501
MAX7502
t
DEVICE
SDA
SCL
HD:STA
PARAMETERS ARE MEASURED FROM 10% TO 90%.
2
C slave address, which is selected using A0, A1,
2
CONDITION
C protocols: write byte, read byte, send byte,
1. I
START
(S)
2
Table
C Slave Addresses
t
SU:DAT
Digital Temperature Sensors and Thermal
BIT 7
I
t
_______________________________________________________________________________________
2
LOW
1
1
1
1.
C-Compatible Bus Interface
Watchdog with Bus Lockup Protection
t
R
t
HIGH
2
C-compatible 2-wire serial
BIT 6
t
0
0
0
F
t
HD:DAT
BIT 5
0
0
0
t
SU:STA
REPEATED START
BIT 4
CONDITION
1
1
1
(SR)
by a read-byte instruction. Use caution when using the
shorter protocols in multimaster systems, as a second
master could overwrite the command byte without
informing the first master. The MAX7500 has eight dif-
ferent slave addresses available; therefore, a maximum
of eight MAX7500 devices can share the same bus.
The MAX7501/MAX7502 each have four different slave
addresses available.
t
HD:STA
BIT 3
A2
1
0
ACKNOWLEDGE
(A)
BIT 2
A1
A1
A1
t
SU:STO
CONDITION
BIT 1
STOP
(P)
A0
A0
A0
t
BUF
CONDITION
START
(S)
BIT 0
RD/W
RD/W
RD/W
5