LPC47M192 datasheet(135/228 Pages) SMSC

135 / 228 page

SMSC DS – LPC47M192

Page 135

Rev. 03/30/05

DATASHEET

7.18.3.6.1

Sleep Mode

This is a low power mode in which bias currents are ‘on’ but the Hardware Monitor Block is not operating. In this

mode, the A/D converter and monitoring cycle will be turned off. Serial bus communication is still possible with any

7.18.3.6.2

Shutdown Mode

This is a low power mode in which bias currents are ‘off’ and the Hardware Monitor Block is not operating. In this

mode, the A/D converter and monitoring cycle will be turned off. Serial bus communication is still possible with any

7.18.3.7

Analog Voltage Measurement

The Hardware Monitor Block contains inputs for directly monitoring the power supplies (+12 V, +5 V, +3.3V, +2.5V,

+1.8V, +1.5V, +Vccp and HVCC or HVSB). These inputs are scaled internally to a internal reference source,

converted via a 8 bit successive approximation register ADC or a Delta-Sigma ADC (Analog-to-Digital Converter),

and scaled such that the correct value refers to 3/4 scale or 192 decimal (except the Vccp input). This removes the

need for external resistor dividers and allows for a more accurate means of measurement since the voltages are

referenced to a known value. The 1.5V input does not have an internal resistor divider. Since these inputs are above

Vcc and below Ground, they are not diode protected to the power rails. The measured values are stored in the

Reading registers and compared with the Limit registers. The status bits in the Interrupt Status Register 1 and the

Interrupt Status Register 2 are set if the measured values are outside (or equal to) the programmed limits.

The Vccp voltage input measures the processor voltage, which will lie in the range of 0V to 3.0V.

The following table shows the values of the analog inputs that correspond to the min and max output codes of the

A/D converter. For a complete list of the ADC conversions see Table 78 in Appendix B.

Input Voltage

+12VIN

+5VIN

VCC/3.3VIN

+2.5VIN

+1.8VIN

+1.5VIN

+VCCP

Min Value (Corresponds

to A/D output 00000000)

<0.062

<0.026

<0.017

<0.013

<0.009

<0.008

<0.012

Max Value (Corresponds

to A/D output 11111111)

>15.938

>6.640

>4.383

>3.320

>2.391

>1.992

>2.988

7.18.3.8

Voltage ID

VID0-VID4 digital inputs are used to store processor Voltage ID codes (for processor operating voltage) in the VID

and VID4 registers (0x47 and 0x49). These VIDs can be read out by the management system using the SMBus

interface. Bits[3:0] in VID register is used for VID3 to VID0 inputs and Bit[0] of VID4 register is used for VID4 input.

VID4 input is multiplexed with +12V_IN analog input. This pin defaults to the +12V_IN analog input at power up and

bit 0 in VID4 register defaults to 0. This pin can be selected for VID4 by setting bit 5 in the Configuration Register

(0x40).

7.18.3.9

Temperature Measurement

Temperatures are measured internally by bandgap temperature sensor and externally using two sets of diode sensor

pins (for measuring two external temperatures). See subsections below.

7.18.3.9.1

Internal Temperature Measurement

Internal temperature can be measured by bandgap temperature sensor. The measurement is converted into digital

format by internal ADC. This data is converted in two’s complement format since both negative and positive

temperature can be measured. This value is stored in Ambient Temperature Reading register (0x27). If this value

out-of-limit (or equal to) the programmed limits in Ambient Temperature High Limit register (0x39) and Ambient

Temperature Low Limit register (0x3A), then the corresponding status bits in the Interrupt Status Registers are set.

7.18.3.9.2

External Temperature Measurement

The Hardware Monitor Block also provides a way to measure two external temperatures using diode sensor pins

(Dx+ and Dx-). The value is stored in the Remote Diode Temperature Reading 1 register (0x26) for D0+ and D0-

pins. The value is stored in the Remote Diode Temperature Reading 2 register (0x52) for D1+ and D1- pins. If this

value is out-of-limit (or equal to) the programmed limits (for D0+ and D0- pins, or D1+ and D1- pins) in Remote

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