isppac-powr1220at8 Lattice Semiconductor Corp., isppac-powr1220at8 Datasheet - Page 26

• Manufacturer Part Number: isppac-powr1220at8
• Description: In-system Programmable Power Supply Monitoring, Sequencing And Margining Controller
• Manufacturer: Lattice Semiconductor Corp.

Lattice Semiconductor
Figure 1-16. TrimCell Driving a Typical DC-DC Converter
Figure 1-16 shows the resistor network between the TrimCell #N in the ispPAC-POWR1220AT8 and the DC-DC
converter. The values of these resistors depend on the type of DC-DC converter used and its operating voltage
range. The method to calculate the values of the resistors R1, R2, and R3 are described in a separate application
note.
Voltage Profile Control
The Margin / Trim Block of ispPAC-POWR1220AT8 consists of eight TrimCells. Because all eight TrimCells in the
Margin / Trim Block are controlled by two common voltage profile control signals, they all operate at the same volt-
age profile. These common voltage profile control signals are derived from a Control Multiplexer. One set of voltage
profile control inputs to the control multiplexer is from a pair of device pins: VPS0, VPS1. The second set of voltage
profile control inputs is from the PLD: PLD_VPS0, PLD_VPS1. The selection between the two sets of voltage pro-
file control signals is programmable and is stored in the E
TrimCell
#N
DAC
R
3
R
1-26
1
2
CMOS memory.
R
2
V
Trim
ispPAC-POWR1220AT8 Data Sheet
OUT
V
Converter
OUT
DC-DC
V
IN