isppac-powr6at6 Lattice Semiconductor Corp., isppac-powr6at6 Datasheet - Page 20

• Manufacturer Part Number: isppac-powr6at6
• Description: In-system Programmable Power Supply Monitoring And Margining Controller
• Manufacturer: Lattice Semiconductor Corp.

Lattice Semiconductor
the SMBus Alert cycle. Refer to the CLTLOCK/SMBA pin and SMBus Alert sections of this datasheet for more
information on how the closed-loop trim status in this I
Figure 15. I
It is possible to read the value of the voltage present on any of the VMON inputs by using the ispPAC-POWR6AT6’s
ADC. Three registers provide the I
Figure 16. ADC Interface Registers
To perform an A/D conversion, one must set the input attenuator and channel selector. Two input ranges may be
set using the attenuator, 0 - 2.048V and 0 - 6.144V. Table 5 shows the input attenuator settings.
Table 5. ADC Input Attenuator Control
The input selector may be set to monitor any one of the six VMON inputs or the VCCA input. Table 6 shows the
codes associated with each input selection.
Table 6. V
MON
2
C Closed Loop Trim Status Register
Address Selection Table
0x00 – CLTLOCK_STATUS (b6 = Read/Write; all others Read Only)
0x01 - ADC_VALUE_LOW (Read Only)
0x02 - ADC_VALUE_HIGH (Read Only)
0x03 - ADC_MUX (Read/Write)
D11
D3
ATTEN (ADC_MUX.4)
b7
b7
b7
b7
X
X
(ADC_MUX.2)
SEL2
SMBA
D10
D2
0
1
0
0
0
0
1
1
b6
b6
b6
b6
X
2
C interface to the ADC (Figure 16).
in6
D1
D9
b5
b5
b5
b5
X
(ADC_MUX.1)
Select Word
SEL1
0
0
1
1
0
0
ATTEN
in5
D0
D8
b4
b4
b4
b4
Resolution
2
C register is used.
2mV
6mV
20
(ADC_MUX.0)
in4
D7
b3
b3
b3
b3
X
1
SEL0
0
1
0
1
0
1
SEL2
in3
D6
b2
b2
b2
b2
1
Full-Scale Range
ispPAC-POWR6AT6 Data Sheet
Input Channel
VMON1
VMON2
VMON3
VMON4
VMON5
VMON6
2.048 V
6.144 V
SEL1
in2
D5
b1
b1
b1
b1
1
DONE
SEL0
in1
D4
b0
b0
b0
b0