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© Andigilog, Inc. 2006
www.andigilog.com
August 2006 - 70A04010
aSC7511
Configuration Register
The configuration register is a read-write register that
stores the controls for masking the ALERT signal, RUN /
STOP control, extended temperature range select and the
pin 6 function select for ALERT or THERM2 . It is located at
address 03h for read and 09h for writing.
Power on default is for all bits reset: no ALERT mask, RUN,
pin 6 is ALERT and normal range, 0°C to 127°C. Table 5
lists the bits of the configuration register.
The mask bit is only functional when pin 6 is configured as
the ALERT pin. When selecting extended range, note that
the values reported will be offset by 64°C and any limits will
have to be adjusted accordingly to match this offset-binary
coding. It is recommended that this configuration not be
changed again, once selected, to avoid confusion.
Bit
Name
Function
0, 1
Reserved
0 = 0°C to +127°C
2
Range Select
1 = -55°C to +150°C
3, 4
Reserved
0 = pin 6 is ALERT
5
ALERT / THERM2
1 = pin 6 is THERM2
0 = RUN
6
RUN / STOP
1 = STOP
0 = ALERT Enabled
7
MASK
1 = ALERT Masked
Table 5. Configuration Register Bit Assignments
Conversion Rate Register
The sensor conversion rate register sets the rate of
conversions. Both local and remote sensors are measured
during a measurement cycle.
Conversions per
Second
Seconds per
Conversion
Code
0.0625
16
00h
0.125
8
01h
0.25
4
02h
0.5
2
03h
1
1
04h
2
0.5
05h
4
0.25
06h
8
0.125
07h
16
0.0625
08h
32
0.03125
09h
64
0.015625
0Ah
Reserved
Reserved
0Bh to FFh
Table 6. Conversion Rate Register Bit
Assignments
The conversion rate register may be written-to at address
04h. The value stored may be read back at any time from
address 0Ah. The lower four bits define the rate from
0.0625 to 64 conversions per second. The default rate is 16
conversions per second designated by a code of 08h. The
rates are described in Table 6.
A single measurement is controlled separately by the one-
shot register, 0Fh, that is described below.
ALERT Limit Registers
There are four limit registers for the ALERT function using
six register locations:
• ALERT Remote High Limit (high and low bytes)
• ALERT Remote Low Limit (high and low bytes)
• ALERT Local High Limit
• ALERT Local Low Limit
These registers may be written or read-back at any time at
the addresses in shown in Table 2. Each limit has a default
value at power-up of 85°C for the high limit and 0°C for the
low limit. The ALERT high limits have a dual purpose in that
they may be used to control the alternate function of pin 6,
the ALERT / THERM2 output when that mode is selected.
Note that the values in the alarm registers must match the
data format selected by bit 2, the normal / extended range
selector in the configuration register. The user should
choose either normal or extended range on power-up and
not change this setting otherwise all limits will be invalid
and have to be adjusted accordingly.
Operation of these registers in thermal management
applications is described in the Operation Section.
One-Shot Register
While the aSC7511 is in standby mode with configuration
register bit 6 high, a single measurement cycle may be
initiated by a write to the one-shot register at address 0Fh.
Any data written is ignored. After the conversion is
completed a set of readings is written to the temperature
registers, comparisons made and alerts generated. The
aSC7511 will then return to standby mode, awaiting the
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