x96012 Intersil Corporation, x96012 Datasheet - Page 15

• Manufacturer Part Number: x96012
• Description: Universal Sensor Conditioner With Dual Look Up Table Memory And Dacs
• Manufacturer: Intersil Corporation

The A/D converter is shared between the two current
generators but the look-up tables, D/A converters, control
bits, and selection bits can be set completely independently.
Bits D1DAS and D2DAS are used to bypass the A/D
converter and look-up tables, allowing direct access to the
inputs of the D/A converters with the bytes in control
registers 3 and 4 respectively. See Figure 9 and the
descriptions of the control bits starting on page 8.
Bits I1DS and I2DS in Control Register 0 select the direction
of the currents through pins I1 and I2 independently See
Figure 8 and the descriptions of the control bits starting on
page 8.
VOLTAGE INPUT
REFERENCE
I
X
X 10%
VOLTAGE
V
ADCOK
15
VOLTAGE
0V
CURRENT
FIGURE 11. D/A CONVERTER POWER-ON RESET RESPONSE
ADC TIME
ADC
FIGURE 10. LOOK-UP TABLE ADDRESSING
REGISTER
STATUS
AD[7:0]
8
6
X96012
Power-on Reset
When power is applied to the VCC pin of the X96012, the
device undergoes a strict sequence of events before the
current outputs of the D/A converters are enabled.
When the voltage at VCC becomes larger than the power-on
reset threshold voltage (V
bits from non-volatile memory into volatile registers. Next,
the analog circuits are powered up. When the voltage at Vcc
becomes larger than a second voltage threshold (V
the ADC is enabled. In the default case, after the ADC
performs four consecutive conversions with the same exact
result, the ADC output is used to select a byte from each
look-up table. Those bytes become the input of the DACs.
REGISTER 2
REGISTER 1
L2DA[5:0]:
L1DA[5:0]:
CONTROL
CONTROL
VCC
6
CONTROL REGISTER 5
CONTROL REGISTER 5
SELECT
D1
D0
SELECT
D1
D0
L2DAS: BIT 6 IN
L1DAS: BIT 4 IN
OUT
OUT
POR
I
X
), the device recalls all control
TIME
TIME
SELECTION BITS
SELECTION BITS
LUT2 ROW
LUT1 ROW
November 19, 2007
ADCOK
FN8216.2
),