MAX1299CEAE+【PDF 15/20 页】IC TEMP SENS W/ADC 16-SSOP

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Sheet目录42

11页 12页 13页 14页 [15页]16页 17页 18页 19页

12-Bit Serial-Output Temperature Sensors

with 5-Channel ADC

______________________________________________________________________________________ 15

Internal Reference

The MAX1298 has a 2.50V internal reference, while the

MAX1299 has a 1.20V internal reference. Both are fac-

tory trimmed for accuracy. When internal reference is

selected, REF can be used to drive an external load

with 100礎 capability. Bypass REF to GND with a 0.1礔

(min) capacitance. Wake-up time is C x 2.5 x 10

s for

the MAX1298 and C x 1.2 x 10

s for the MAX1299.

External Reference

The MAX1298 can directly accept reference voltages at

REF from 0.8V to 2.5V, while the MAX1299 can directly

accept reference voltages from 0.8V to 1.2V. Bypass

REF to GND with a 0.1礔 capacitor. Temperature mea-

surements always use internal reference.

Power Modes

The MAX1298 (MAX1299) typically requires supply cur-

rents of 380礎 (350礎) or 310礎 (280礎) when per-

forming voltage conversions at 100% duty cycle with

internal or external references, respectively. The differ-

ence reflects the power requirement of an internal refer-

ence buffer amplifier that can accommodate external

loads. Temperature conversions at 100% duty cycle

increase supply currents to 440礎 (400礎) through

additional amplification, buffer, and bias circuitry that is

otherwise inactive.

Table 1. Output Data Format

Table 2. Configuration-Byte Format

D11

D10

BIT 7

(MSB)

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

(LSB)

Start

PM1

PM0

REF

BIT

NAME

DESCRIPTION

7 (MSB)

Start

First logic 1 after CS goes low. (See Input Data Format.)

6, 5, 4, 3

Must be 0000 to load a configuration byte.

2, 1

PM1, PM0

These 2 bits select the desired power mode (Table 4).

REF

A logic high enables the internal reference. A logic low disables the internal reference and

selects the external reference mode.

Table 3. Conversion-Byte Format

BIT 7

(MSB)

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

(LSB)

Start

SEL3

SEL2

SEL1

SEL0

BIT

NAME

DESCRIPTION

7 (MSB)

Start

First logic 1 after CS goes low. (See Input Data Format.)

6, 5, 4

Must be 010 to load a conversion byte.

3, 2, 1, 0

SEL3, SEL2,

SEL1, SEL0

These 4 bits select the input configuration (Table 5).

Figure 6. Detailed SSTRB Timing

CSH

SSTRB

CONV

SCK

CSS

CSB

SSTRB

SCLK

DOUT

PDO CLOCKED IN

SSTRB TIMING

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