ADUC7126 Analog Devices, ADUC7126 Datasheet - Page 43

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ADUC7126

Manufacturer Part Number
ADUC7126
Description
Precision Analog Microcontroller, 12-Bit Analog I/O, Large Memory, ARM7TDMI MCU with Enhanced IRQ Handler
Manufacturer
Analog Devices
Datasheet

Specifications of ADUC7126

Mcu Core
ARM7 TDMI
Mcu Speed (mips)
40
Gpio Pins
40
Adc # Channels
16
Other
PWM

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TEMPREF Register
Name:
Address:
Default Value:
Access:
Table 35. TEMPREF MMR Bit Descriptions
Bit
[15:9]
8
[7:0]
BAND GAP REFERENCE
Each ADuC7124/ADuC7126 provides on-chip band gap
references of 2.5 V, which can be used for the ADC and DAC.
This internal reference also appears on the V
the internal reference, a 0.47 µF capacitor must be connected from
the external V
Description
Reserved.
Temperature reference voltage sign bit.
Temperature sensor offset calibration voltage.
To calculate the V
perform the following calculation:
If TEMPREF sign is negative,
where TEMPREF[8] = 1
Or
If TEMPREF sign is positive,
where TEMPREF[8] = 0.
Finally,
Insert V
Note that the ADC Code Value 2292 is a default value
when using the TEMPREF register. It is not an exact
value and must only be used with the TEMPREF
register.
C
C
V
T − T
TREF
TREF
TREF
REF
= 2292 − TEMPREF[7:0]
= TEMPREF[7:0] + 2292
= ((C
REF
TREF
pin to AGND to ensure stability and fast
TEMPREF
0xFFFF0548
0xXXXX
Read/write
= (V
into
TREF
ADC
× V
− V
TEMP
REF
TREF
)/4096) × 1000
from the TEMPREF register,
) × K
REF
pin. When using
Rev. B | Page 43 of 104
response during ADC conversions. This reference can also be
connected to an external pin (V
for other circuits in the system. An external buffer is required
because of the low drive capability of the VREF output (<5 µA).
A programmable option also allows an external reference input
on the V
internal reference. Therefore, the external reference source must
be capable of overdriving the internal reference source.
REFCON Register
Name:
Address:
Default Value:
Access:
The band gap reference interface consists of an 8-bit MMR
REFCON, described in Table 36.
Table 36. REFCON MMR Bit Descriptions
Bit
[7:2]
1
0
To connect an external reference source to the ADuC7124/
ADuC7126, configure REFCON = 0x00. ADC and the DACs
can be configured to use same or a different reference resource
(see Table 66).
REF
Description
Reserved.
Internal reference power-down bit.
Set this bit to 1 to power down the internal reference
source. This bit should be set when connecting an
external reference source.
Clear this bit to enable the internal reference.
This bit is cleared by default.
Internal reference output enable.
Set by the user to connect the internal 2.5 V reference
to the V
external component but must be buffered.
Cleared by the user to disconnect the reference from
the V
pin. Note that it is not possible to disable the
REF
REF
pin.
pin. The reference can be used for an
ADuC7124/ADuC7126
REF
REFCON
0xFFFF048C
0x00
Read/write
) and used as a reference

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