Rainbow-electronics MAX6696 Manual de usuario descargar pdf (Pagina 15)

byte’s POR state is 06h (4Hz). The MAX6695/MAX6696

use only the 3 LSBs of the control register. The 5 MSBs

are don’t care and should be set to zero. The conver-

sion rate tolerance is ±25% at any rate setting.

Valid A/D conversion results for all channels are avail-

able one total conversion time after initiating a conver-

sion, whether conversion is initiated through the

RUN/STOP bit, hardware STBY pin, one-shot com-

mand, or initial power-up.

Slave Addresses

The MAX6695 has a fixed address of 0011 000. The

MAX6696 device address can be set to any one of nine

different values at power-up by pin strapping ADD0

and ADD1 so that more than one MAX6695/MAX6696

can reside on the same bus without address conflicts

(Table 10).

The address pin states are checked at POR and RESET

only, and the address data stays latched to reduce qui-

escent supply current due to the bias current needed for

high-impedance state detection. The MAX6695/

MAX6696 also respond to the SMBus Alert Response

slave address (see the Alert Response Address section).

POR and UVLO

To prevent unreliable power-supply conditions from

corrupting the data in memory and causing erratic

behavior, a POR voltage detector monitors V

and

clears the memory if V

falls below 1.45V (typ; see

Electrical Characteristics). When power is first applied

and V

rises above 2.0V (typ), the logic blocks begin

operating, although reads and writes at V

levels

below 3.0V are not recommended.

Power-Up Defaults

• Interrupt latch is cleared.

• Address select pin is sampled.

• ADC begins autoconverting at a 4Hz rate for

channel 2/local and 8Hz for channel 1.

• Command register is set to 00h to facilitate quick

internal Receive Byte queries.

•T

HIGH

and T

LOW

registers are set to default max

and min limits, respectively.

• Hysteresis is set to 10°C.

MAX6695/MAX6696

Dual Remote/Local Temperature Sensors with

SMBus Serial Interface

______________________________________________________________________________________ 15

BIT 3

BIT 1

BIT0

HEX

CONVERSION

RATE (Hz) REMOTE

CHANNEL 2 AND

LOCAL

CONVERSION RATE

(Hz) REMOTE

CHANNEL 1

CONVERSION

PERIOD (s)

REMOTE CHANNEL

2 AND LOCAL

CONVERSION

PERIOD (s)

REMOTE CHANNEL

0 0 0 00h 0.0625 0.125 16 8

0 0 1 01h 0.125 0.25 8 4

0 1 0 02h 0.25 0.5 4 2

0 1 1 03h 0.5 1 2 1

1 0 0 04h 1 2 1 0.5

1 0 1 05h 2 4 0.5 0.25

1 1 0 06h 4 8 0.25 0.125

1 1 1 07h 4 8 0.25 0.125

Table 9. Conversion-Rate Control Register (POR = 0110)

ADD0 ADD1 ADDRESS

GND GND 0011 000

GND High-Z 0011 001

GND V

0011 010

High-Z GND 0101 001

High-Z High-Z 0101 010

High-Z V

0101 011

GND 1001 100

High-Z 1001 101

1001 110

Table 10. POR Slave Address Decoding

(ADD0 and ADD1)

Note: Extended resolution applies only for conversion rate control register values of 05h or less.

1 2 ... 10 11 12 13 14 15 16 17 18 19 20

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