EVAL-ADT7470EBZ Analog Devices Inc, EVAL-ADT7470EBZ Datasheet - Page 17

• Manufacturer Part Number: EVAL-ADT7470EBZ
• Description: Temperature Sensor Eval. Board
• Manufacturer: Analog Devices Inc

Specifications of EVAL-ADT7470EBZ

• Silicon Manufacturer: Analog Devices
• Application Sub Type: Temperature Sensor Hub & Fan Controller
• Kit Application Type: Power Management
• Silicon Core Number: ADT7470
• Sensor Type: Temperature
• Interface: SMBus (2-Wire/I²C)
• Voltage - Supply: 3 V ~ 5.5 V
• Embedded: No
• Utilized Ic / Part: ADT7470
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sensitivity: -
• Sensing Range: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

STATUS REGISTERS
The results of limit comparisons are stored in Status Register 1
and Status Register 2. The status register bit for each channel
reflects the status of the last measurement and limit comparison
on that channel. If a measurement is within limits, the corre-
sponding status register bit is cleared to 0. If the measurement
is out of limit, the corresponding status register bit is set to 1.
The state of the various measurement channels can be polled
by reading the status registers over the serial bus. When Bit 7
(OOL) of Status Register 1 (Register 0x41) is a 1, an out-of-limit
event has been flagged in Status Register 2. This means that
Status Register 2 must be read only when the OOL bit is set.
Reading the status registers clears the appropriate status bit as
long as the error condition that caused the interrupt has cleared.
Status register bits are sticky. Whenever a status bit is set,
indicating an out-of-limit condition, it remains set even if the
event that caused it has gone away (until read). The only way to
clear the status bit is to read the status register when the event has
gone away.
Table 12. Interrupt Status Register 1 (Register 0x41)
Bit No.
7
6
5
4
3
2
1
0
Table 13. Interrupt Status Register 2 (Register 0x42)
Bit No.
7
6
5
4
3
2
1
0
Mnemonic
Fan 4
Fan 3
Fan 2
Fan 1
NORM
R10T
R9T
R8T
Mnemonic
OOL
R7T
R6T
R5T
R4T
R3T
R2T
R1T
Description
A 1 indicates that Fan 4 has dropped below minimum speed or is above maximum speed.
A 1 indicates that Fan 3 has dropped below minimum speed or is above maximum speed.
A 1 indicates that Fan 2 has dropped below minimum speed or is above maximum speed.
A 1 indicates that Fan 1 has dropped below minimum speed or is above maximum speed.
A 1 indicates that the temperatures are below T
A 1 indicates that TMP05 Temperature 10 high or low limit has been exceeded.
A 1 indicates that TMP05 Temperature 9 high or low limit has been exceeded.
A 1 indicates that TMP05 Temperature 8 high or low limit has been exceeded.
Description
A 1 denotes that a bit in Status Register 2 is set and Status Register 2 should now be read.
A 1 indicates that TMP05 Temperature 7 high or low limit has been exceeded.
A 1 indicates that TMP05 Temperature 6 high or low limit has been exceeded.
A 1 indicates that TMP05 Temperature 5 high or low limit has been exceeded.
A 1 indicates that TMP05 Temperature 4 high or low limit has been exceeded.
A 1 indicates that TMP05 Temperature 3 high or low limit has been exceeded.
A 1 indicates that TMP05 Temperature 2 high or low limit has been exceeded.
A 1 indicates that TMP05 Temperature 1 high or low limit has been exceeded.
Rev. C | Page 17 of 40
Interrupt status mask registers (Register 0x72 and Register 0x73)
allow individual interrupt sources to be masked from causing an
SMBALERT . However, if one of these masked interrupt sources
goes out of limit, its associated status bit is still set in the interrupt
status registers. This allows the device to be periodically polled to
determine if an error condition has subsided, without unnecessarily
tying up precious system resources handling interrupt service
routines. The issue is that the device could potentially interrupt the
system every monitoring cycle (< 1 sec) as long as a measurement
parameter remains out of limit. Masking eliminates unwanted
system interrupts.
The OOL bit (Register 0x41 Bit[7]), and the NORM bit
(Register 0x42 Bit[3]) do not activate SMBALERT .
MIN
and that the fans are supposed to be off.
ADT7470