MAX6604 MAXIM [Maxim Integrated Products], MAX6604 Datasheet - Page 8

• Manufacturer Part Number: MAX6604
• Description: Precision Temperature Monitor for DDR Memory Modules
• Manufacturer: MAXIM [Maxim Integrated Products]

the critical temperature register is likely to be higher than
that of the alarm-upper-boundary register. As a result,
when the temperature is above the critical temperature,
it is likely that it is above the alarm-upper-boundary as
well. In interrupt mode, EVENT asserts when the temper-
ature crosses the alarm upper boundary.
If the EVENT output is cleared and the temperature
continues to increase until it crosses the critical temper-
ature threshold, EVENT asserts again. Because the
temperature is greater than the critical temperature
threshold, a clear event command does not clear the
EVENT output. Once the temperature drops below the
critical temperature, EVENT deasserts immediately.
If the EVENT output is not cleared before the tempera-
ture goes above the critical temperature threshold,
EVENT remains asserted. Attempting a clear event
command has no effect until the temperature drops
below the critical temperature, at which point EVENT
deasserts immediately because of the earlier clear
event command. If no clear event command is attempt-
ed, EVENT remains asserted after the temperature
drops below the critical temperature. At this point, a
clear event command deasserts EVENT.
Precision Temperature Monitor for
DDR Memory Modules
Table 3. Capability Register (Read Only)
8
Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10
15:5
BIT
4:3
0
1
2
_______________________________________________________________________________________
Basic capability
1: Has alarm and critical trips capability
Accuracy
0 = Default accuracy ±2°C over the active and ±3°C monitor ranges
1 = High accuracy ±1°C over the active and ±2°C monitor ranges
Wider range
0 = Values lower than 0°C are clamped and represented as binary value 0
1 = Can read temperature below 0°C and set sign bit accordingly
Temperature resolution
00 = 0.5°C LSB
01 = 0.25°C LSB
10 = 0.125°C LSB
11 = 0.0625°C LSB
0: Reserved for future use (RFU). Must be zero.
DEFINITION (DESCRIPTIONS IN BOLD TYPE APPLY TO THE MAX6604)
Bit 9
Bit 8
Bit 7
This register indicates the capabilities of the thermal
sensor, including accuracy, temperature range, and
resolution. See Table 3 for register details.
This register controls the various features of EVENT
functionality, and controls the bit for thermal-sensor
shutdown mode. See Table 4 for register details.
When enabled, hysteresis is applied to temperature varia-
tions around trigger points. For example, consider the
behavior of the alarm window bit (bit 14 of the tempera-
ture register) when the hysteresis is set to 3°C. As the
temperature rises, bit 14 is set to 1 (temperature is above
the alarm window) when the temperature register con-
tains a value that is greater than the value in the alarm
temperature upper boundary register. If the temperature
decreases, bit 14 remains set until the measured temper-
ature is less than or equal to the value in the alarm tem-
perature upper boundary register minus 3°C.
Bit 6
Detailed Register Descriptions
Configuration Register (Read/Write)
Bit 5
Capability Register (Read Only)
[Address = 00h, POR = 0017h]
[Address = 01h, POR = 0000h]
Bit 4
Bit 3
Bit 2
Bit 1
Hysteresis
Bit 0