Rainbow-electronics MAX6690 Bedienungsanleitung PDF herunterladen (Seite 13)

MAX6690

2°C Accurate Remote/Local Temperature

Sensor with SMBus Serial Interface

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Status Byte Functions

The status byte register (Table 7) indicates which (if

any) temperature thresholds have been exceeded. This

byte also indicates whether the ADC is converting and

whether there is an open circuit in the remote-diode

DXP–DXN path. After POR, the normal state of all the

flag bits is zero, assuming none of the alarm conditions

are present. The status byte is cleared by any success-

ful read of the status byte, unless the fault persists.

Note that the ALERT interrupt latch is not automatically

cleared when the status flag bit indicating the ALERT is

cleared. The fault condition must be eliminated before

the ALERT can be cleared.

When reading the status byte, check for internal bus

collisions caused by asynchronous ADC timing, or else

disable the ADC prior to reading the status byte

(through the RUN/STOP bit in the configuration byte). In

one-shot mode, read the status byte only after the con-

version is complete, which is 150ms max after the one-

shot conversion is commanded.

BIT NAME POR STATE FUNCTION

7 (MSB) MASK1 0 Masks ALERT interrupts if high.

6 RUN/STOP 0 Standby mode control bit; if high, standby mode is initiated.

5 ETA 0 If high, lower temperature range is extended from 0°C to -64°C.

4 PRCM 0 If high, parasitic resistance cancellation mode is enabled.

3 SPNP 0 —

2 to 0 RFU 0 Reserved.

Table 6. Configuration-Byte Bit Assignments

RLTS 00h 0000 0000 Read Internal Temperature

RRTE 01h 0000 0000 Read External Temperature

RSL 02h 0000 0000 Read Status Byte

RCL 03h 0000 0000 Read Configuration Byte

RCRA 04h 0000 0010 Read Conversion Rate Byte

RLHN 05h 0111 1111 Read Internal High Limit

RLLI 06h 1100 1001 Read Internal Low Limit

RRHI 07h 0111 1111 Read External High Limit

RRLS 08h 1100 1001 Read External Low Limit

WCA 09h N/A Write Configuration Byte

WCRW 0Ah N/A Write Conversion Rate Byte

WLHO 0Bh N/A Write Internal High Limit

WLLM 0Ch N/A Write Internal Low Limit

WRHA 0Dh N/A Write External High Limit

WRLN 0Eh N/A Write External Low Limit

OSHT 0Fh N/A One-Shot

RRET 10h 0000 0000 Read External Extended Temperature

RLET 11h 0000 0000 Read Internal Extended Temperature

N/A FEh 4D Read Device ID

N/A FFh 08 Read Device Revision

Table 5. Command-Byte Bit Assignments

1 2 ... 8 9 10 11 12 13 14 15 16

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