ASC7511 查看數據表（PDF） - Unspecified

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ASC7511

LOW-VOLTAGE 2-WIRE DIGITAL TEMPERATURE SENSOR WITH THERMAL ALARM

Unspecified 

aSC7511

Status Register

The status register is a read-only register for reporting the

state of the aSC7511’s alarms. It is a read-only register

located at 02h.

When any high or low local limits or high or low remote

limits are exceeded, bits 3 through 6 are set accordingly

and the ALERT pin 6 will be driven low. If the remote

sensor is open-circuit, bit 2 will be set and the ALERT will

be asserted. Reading the status register will re-set these

flags if the alerted condition has been removed, however,

the ALERT pin will remain asserted until the master has

serviced the SMBus alert.

The local and remote THERM limit trip are reported in bits 0

and 1 respectively. These two bits are reset only by the

temperature falling below the THERM limit by the amount

set into the hysteresis register.

Bit 7 will be high when the converter is busy. The list of

status register bit assignments is in Table 3. Each condition

is asserted when the bit is high. Default is 0.

Bit

Name

Function

0 LTHERM

1 RTHERM

2 ROPEN

3 RLOW

4 RHIGH

5 LLOW

6 LHIGH

7 BUSY

Local sensor > THERM limit

Remote sensor > THERM limit

Remote sensor open-circuit

Remote sensor ≤ low limit

Remote sensor > high limit

Local sensor ≤ low limit

Local sensor > high limit

Converter in process of conversion

Table 3. Status Register Bit Assignments

Read Write

Address Address

Description

Default

Value

Read Write

Address Address

Description

Default

Value

n/a

n/a Address Pointer

n/a

00h

n/a Local Temperature (high-byte)2

00h / 0°C

01h

n/a Remote Temperature (high-byte)2

00h

10h

n/a Remote Temperature (low-byte)2 00h / 0°C

02h

n/a Status

n/a

03h

09h Configuration

00h

04h

0Ah Conversion rate

08h

05h

0Bh Local High Limit

55h / 85°C

06h

0Ch Local Low Limit

00h / 0°C

07h

0Dh Remote High Limit (high-byte)2 55h / 85°C

13h

13h Remote High Limit (low-byte)2

08h

0Eh Remote Low Limit (high-byte)2

00h / 0°C

14h

14h Remote Low Limit (low-byte)2

00h / 0°C

00h / 0°C

n/a

0Fh One-Shot Measurement

n/a

11h

11h Remote Temp. Offset (high-byte) 2 00h / 0°C

12h

12h Remote Temp. Offset (low-byte)2 00h / 0°C

19h

19h Remote THERM Limit

55h / 85°C

20h

20h Local THERM Limit

21h

21h THERM Hysteresis

55h / 85°C

0Ah /

10°C

22h

22h Consecutive ALERT

01h

FEh

n/a Manufacturer ID

61h

FFh

n/a Die Revision Code

00h

Notes:

1. Low-byte values are fractional degrees, MSB of lower byte is 0.5°C

2. Changing to extended range adds 64°C to values reported, but limit settings are not changed and must be corrected by the user.

Table 4. aSC7511 Registers

© Andigilog, Inc. 2006

-7-

www.andigilog.com

August 2006 - 70A04010

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