Updated Outline Dimensions - Analog Devices ADT7460 Manual

Table 76. Register 0x79— THERM Status Register (Power-On Default = 0x00)
Bit Name R /W
<7:1> TMR Read-On
<0> ASRT/TMR0 Read-Only
Table 7 7. Re giste 0x7A— THE r
Bit Name R/W
<7:0> LIMT Read/Write
Table 78. Register 0x7B—F
Bit Name R/W
<1:0> FAN1 Read/Write
<3:2> FAN2 Read/Write
<5:4> FAN3 Read/Write
<7:6> FAN4 Read/Write
Descrip tion
ly Times how long THERM
exceeds 45.52 ms.
Is set high on the assertion of the THERM input. Cleared on read. If the THERM assertion time exceeds
45.52 ms, this bit is
times from 45.52 ms to 5.82 s to be reported back with a resolution of 22.7
RM Limit Register (Pow
Description
Sets maximum THERM assertion length allowed before an interrupt is generated. This is an 8-bit limit
with a resolution of 22.76 ms allowing THERM assertion limits of 45.52 ms to 5.82 s to be
programmed. If the THERM assertion time exceeds this limit, Bit 5 (F4P) of Interrupt Status Register 2
(Reg. 0x42) is set. If the limit value is 0x00, an interrupt is generated immediately upon the assertion
of the THERM input.
an Pulses per Revolution Register (Power-On Default = 0x55)
Description
Sets number of pulses to be counted when measuring Fan1 speed. Can be used to determine fan's
pulses per revolution for unknown fan type.
Pulses Counted
00 = 1
01 = 2 (Default)
10 = 3
11 = 4
Sets number of pulses to be counted when measuring FAN2 speed. Can be used to determine fan's
pulses per revolution for unknown fan type.
Pulses Counted
00 = 1
01 = 2 (Default)
10 = 3
11 = 4
Sets number of pulses to be counted when measuring FAN3 speed. Can be used to determine fan's
pulses per revolution for unknown fan type.
Pulses Counted
00 = 1
01 = 2 (Default)
10 = 3
11 = 4
Sets number of pulses to be counted when measuring FAN4 speed. Can be used to determine fan's
pulses per revolution for unknown fan type.
Pulses Counted
00 = 1
01 = 2 (Default)
10 = 3
11 = 4
input is asserted. These seven bits read 0 until the THERM assertion time
set and becomes the LSB of the 8-bit TMR reading. This allows THERM
er-On Default = 0x00)
Rev. C | Page 49 of 52
ADT7460
assertion
6 ms.