MAX6652AUB+T【PDF 8/12 页】IC TEMP SENS/MON 10-UMAX

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Low-Power Shutdown Mode

Setting bit 0 in the configuration register to 0 stops the

monitoring loop and puts the MAX6652 into low-power

shutdown mode. In this mode, the I

C-compatible/

SMBus interface remains active, and the supply current

drops to 10礎 or less.

Power-On Reset (POR)

The MAX6652 power-on reset supply (POR) voltage is

typically 2V. Below this supply voltage, all registers are

reset, the device is put into shutdown mode, and the

C-compatible/SMBus interface is inactive.

Alarm Threshold Registers

Two registers, a hot temperature limit (T

HOT

) at 39h and

a hot temperature hysteresis (T

HYST

) at 3Ah, store

alarm threshold data (Table 1). If a measured tempera-

ture exceeds the value of T

HOT

, an ALERT is asserted.

Alerts are cleared and reasserted depending on the

interrupt mode selected in the temperature configura-

tion register (see ALERT Interrupts).

The POR state of the T

HOT

+80癈. The POR state of the T

HYST

0001 or +65癈.

High and low limits for the voltage inputs are stored in

registers 2Bh through 32h. If a measured voltage is

less than V

LOW

or greater than V

HIGH

, an ALERT is

asserted.

The POR states of the high- and low-voltage limits are

1.1 and 0.9 times the nominal voltage for each input,

respectively.

Interrupt Status Byte Functions

The interrupt status register records temperature or

voltage fault conditions whenever a limit is exceeded

(Table 5). Bits 0 through 3 correspond to the 2.5V, 12V,

3.3V, and 5V internal V

voltage inputs, and bit 4 cor-

responds to the temperature. If a threshold has been

crossed, the appropriate bit will contain a 1. In the

default and one-time interrupt modes, reading the sta-

tus register clears the register until a new out-of-range

condition is detected.

ALERT Interrupts

An out-of-range voltage or temperature causes the

ALERT output signal to be asserted. However, if the

assertion is caused by an out-of-range temperature, the

ALERT output can operate in one of three different

modes: default, one-time interrupt, and comparator

modes. The ALERT signal can be cleared only by read-

ing the interrupt status register (Table 5), except when

the ALERT has been activated by an out-of-range tem-

perature in comparator mode. In this case, ALERT is

only cleared when the fault is removed. Reading the

interrupt status register also clears this register, except

for bit 4 in comparator mode. Unless the fault is

removed, ALERT will be reasserted after the next con-

version cycle. The ALERT output can also be masked

by writing to the appropriate bits in the interrupt mask

The interrupt does not halt conversions. New tempera-

ture and voltage data continue to be available over the

C-compatible/SMBus interface after ALERT is assert-

ed. The three temperature ALERT modes are illustrated

in Figure 1 and are selected through the temperature

configuration register (Table 7). The ALERT output pin

is open drain, so the device can share a common inter-

rupt line.

Temperature Sensor and System Monitor

in a 10-Pin 礛AX

8 _______________________________________________________________________________________

Table 6. Interrupt Mask Register (Address 43h, Power-Up Default = 00h)

BIT

NAME

READ/WRITE

DESCRIPTION

2.5V

R/W

Setting the bit to 1 disables the interrupt status register bit (bit 0) and the ALERT

output for the 2.5V

input.

12V

R/W

Setting the bit to 1 disables the interrupt status register bit (bit 1) and the ALERT

output for the 12V

input.

3.3V

R/W

Setting the bit to 1 disables the interrupt status register bit (bit 2) and the ALERT

output for the 3.3V

input.

5.0V

R/W

Setting the bit to 1 disables the interrupt status register bit (bit 3) and the ALERT

output for the V

input.

Tem p er atur e

R/W

Setting the bit to 1 disables the interrupt status register bit (bit 4) and the ALERT

output for temperature.

5, 6, 7

Reserved

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