Linear Technology DC1605B Demo Manual page 4

DEMO MANUAL DC1605B
theory of operation
The GPI input pins can be used to override fault conditions
by configuring them as MARG or UVDIS. The active-low
MARG function allows the LTC2936 to ignore OV and UV
conditions. The active-low UVDIS function is a special
case of the MARG function. It allows the device to ignore
UV conditions.
INPUT OPTIONS
MANUAL RESET
MARGIN
UV DISABLE
AUXC (NO PULL-UP)
GPIO
THE BOARD
The LTC2936 chip is mounted on the topside of the board
with support ADC and DAC circuitry on the back. The sup-
port circuitry is powered from 5V.
The ADC provides voltage readings for all six voltage
inputs to the LTC2936 and also reads the GPI and GPIO
24-BIT ADC
(LTC2499)
2
I C BUS
12-BIT ADC
(LTC2637)
4
INTERNAL
LOGIC
V1-V6, GPI1-2, GPIO1-3
V1-V6
INT 5V,
EXT 3.3V,
OR EXT 4V TO 14V
TOPSIDE COMPONENT
BOTTOM COMPONENT
Figure 2. Simplified Block Diagram of the DC1605B
voltages for a total of eleven. Although the ADC updates
at a relatively slow rate, it provides the equivalent of
eleven 4½-digit digital multimeters. Think of the ADC as
a collection of independent voltage readings, whereas the
LTC2936 simply makes a comparison to each of the Vn
input voltages. The simplest demonstration of the DC1605B
is to power and control the board via the DC1613 USB
controller. The controller provides 5V supply and I
SMBus read/write control. This setup provides an easy
quick way to demonstrate the LTC2936's capabilities.
V1 GPIO1
V2
LTC2936
GPIO2
6-CH VOLTAGE
V3
SUPERVISOR
WITH EEPROM
V4
GPIO3
V5
COMP (1:6)
V6
V V
PWR DD33
2
I C BUS
+5V FROM USB
BLUE/RED
BLUE/RED
BLUE/RED
BLUE/RED
3.3V
OUT
GREEN
POWER
SWITCH
5V
(LTC4415)
GREEN
5V LDO
(LT1761-5)
POWER JACK
6V TO 14V
DC1605B F02
2
C/
dc1605bf