Endura RADISYS KP915GV - Manual (Page 41)

KP915GV Product Manual
41
• Package 48-pin Lead Free LQFP
3.3.2 Hardware Management Interface
The LM96000, hardware monitor, has a two wire digital interface compatible with SMBus 2.0. Using
an 8-bit Σ∆ ADC, the LM96000 measures:
• The temperature of two remote diode connected transistors as well as its own die
• The VCCP, 2.5V, 3.3VSBY, 5.0V, and 12V supply (internal scaling resistors).
REGISTER
INPUT
ATTENUATORS
E XTERNAL
DIODE SIGNAL
CONDITIONING
AND
ANALOG
MUTIPLEXER
FAN SPEED
COUNTER
8- BIT
ADC
VID[4:0]
TACH[4:1]
12VIN
5VIN
3.3SBY
REMOTE1+
VCCP_IN
2.5VIN
REMOTE2 -
REMOTE1 -
INTERNAL
TEMP
SENSOR
REMOTE2+
SERIAL BUS
INTERFACE SMBDAT
SMBCLK
VOLTAGE. FAN
SPEED.
TEMPREATURE. AND
LIMIT VALUE
REGISTERS
LIMIT
COMPARATORS
FAN PWM CONTROL
&PWM VALUE
REGISTERS
PWM1
PWM3/
ADDRESS
ENABLE
PWM2
Figure 9. NS LM96000CIM Block Diagram
• 2-wire, SMBus 2.0 compliant, serial digital interface
• 8-bit Σ∆ ADC
• Monitors VCCP, VRTC battery, 3.3 VSBY, 5.0V, and 12V motherboard/processor supplies
• Monitors 2 remote thermal diodes
• Programmable autonomous fan control based on temperature readings
• Noise filtering of temperature reading for fan control
• 1.0°C digital temperature sensor resolution
• 3 PWM fan speed control outputs
• Provides high and low PWM frequency ranges
• 4 fan tachometer inputs
• Monitors 5 Voltage Identification (VID) control lines