NVT224ARQZ-REEL datasheet(11/58 Pages) ONSEMI

Part #	NVT224ARQZ-REEL

Description	Remote Thermal Monitor

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NVT224

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connected to a common SMBALERT line connected to the

master. If a device’s SMBALERT line goes low, the

following events occur:

1. SMBALERT is pulled low.

2. The master initiates a read operation and sends the

alert response address (ARA = 0001 100). This

general call address must not be used as a specific

device address.

3. The device whose SMBALERT output is low

responds to the alert response address, and the

master reads its device address. The address of the

device is now known and can be interrogated in

the usual way.

4. If more than one device’s SMBALERT output is

low, the one with the lowest device address has

priority in accordance with normal SMBus

arbitration.

5. Once the NVT224 has responded to the alert

response address, the master must read the status

registers, and the SMBALERT is cleared only if

the error condition has gone away.

SMBus Timeout

The NVT224 includes an SMBus timeout feature. If there

is no SMBus activity for 35 ms, the NVT224 assumes that

the bus is locked and releases the bus. This prevents the

device from locking or holding the SMBus expecting data.

Some SMBus controllers cannot handle the SMBus timeout

feature, so it can be disabled.

Configuration Register 1 (0x40)

Bit 6 TODIS = 0; SMBus timeout enabled (default).

Bit 6 TODIS = 1; SMBus timeout disabled.

Virus Protection

To prevent rogue programs or viruses from accessing

critical NVT224 register settings, the lock bit can be set.

Setting Bit 1 of Configuration Register 1 (0x40) sets the lock

bit and locks critical registers. In this mode, certain registers

can no longer be written to until the NVT224 is powered

down and powered up again. For more information on which

registers are locked, see the Register Tables section.

Voltage Measurement Input

The NVT224 has one external voltage measurement

channel. It can also measure its own supply voltage, VCC.

Pin 14 can measure VCCP. The VCC supply voltage

measurement is carried out through the VCC pin (Pin 3). The

VCCP input can be used to monitor a chipset supply voltage

in computer systems.

Analog−to−Digital Converter

All analog inputs are multiplexed into the on−chip,

successive approximation, analog−to−digital converter.

This has a resolution of 10 bits. The basic input range is 0 V

to 2.25 V, but the input has built−in attenuators to allow

measurement of VCCP without any external components. To

allow for the tolerance of the supply voltage, the ADC

produces an output of 3/4 full scale (decimal 768 or 300 hex)

for the nominal input voltage and so has adequate headroom

to deal with overvoltages.

Input Circuitry

The internal structure for the VCCP analog input is shown

in Figure 19. The input circuit consists of an input protection

diode, an attenuator, and a capacitor to form a first−order,

low−pass filter that gives the input immunity to high

frequency noise.

Figure 19. Structure of Analog Inputs

VCCP

17.5kW

52.5kW

35pF

Voltage Measurement Registers

Register 0x21, VCCP Reading = 0x00 default

Register 0x22, VCC Reading = 0x00 default

VCCP Limit Registers

Associated with the VCCP measurement channel is a high

and low limit register. Exceeding the programmed high or

low limit causes the appropriate status bit to be set.

Exceeding either limit can also generate SMBALERT

interrupts.

Register 0x46, VCCP Low Limit = 0x00 default

Register 0x47, VCCP High Limit = 0xFF default

Table 2 shows the input ranges of the analog inputs and

output codes of the 10−bit ADC.

When the ADC is running, it samples and converts a

voltage input in 711

ms and averages 16 conversions to

reduce noise; a measurement takes nominally 11.38 ms.

Extended Resolution Registers

Voltage measurements can be made with higher accuracy

using the extended resolution registers (0x76 and 0x77).

Whenever the extended resolution registers are read, the

corresponding data in the voltage measurement registers is

locked until their data is read. That is, if extended resolution

is required, then the extended resolution register must be

read first, immediately followed by the appropriate voltage

measurement register.

Additional ADC Functions for Voltage Measurements

A number of other functions are available on the NVT224

to offer the system designer increased flexibility.

Turn−Off Averaging

For each voltage measurement read from a value register,

16 readings have been made internally, and the

results averaged, before being placed into the value register.

For instances where faster conversions are needed, setting

Bit 4 of Configuration Register 2 (0x73) turns averaging off.

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NVT224ARQZ-REEL Datasheet(PDF) 11 Page - ON Semiconductor

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