4
dc1605bf
DEMO MANUAL DC1605B
theory of operation
Figure 2. Simplified Block Diagram of the DC1605B
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.
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 V
n
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
2
C/
SMBus read/write control. This setup provides an easy
quick way to demonstrate the LTC2936’s capabilities.
GPIO
INPUT OPTIONS
MANUAL RESET
MARGIN
UV DISABLE
AUXC (NO PULL-UP)
INTERNAL
LOGIC
LTC2936
6-CH VOLTAGE
SUPERVISOR
WITH EEPROM
V1
V2
V3
V4
V5
V6
V
PWR
GPIO1
GPIO2
GPIO3
GPI1
GPI2
BLUE/RED
BLUE/RED
BLUE/RED
GREEN
3.3V
OUT
INT 5V,
EXT 3.3V,
OR EXT 4V TO 14V
V1-V6, GPI1-2, GPIO1-3
V1-V6
I
2
C BUS
I
2
C BUS
24-BIT ADC
(LTC2499)
12-BIT ADC
(LTC2637)
POWER
SWITCH
(LTC4415)
5V LDO
(LT1761-5)
POWER JACK
6V TO 14V
GREEN
+5V FROM USB
5V
DC1605B F02
BLUE/RED
TOPSIDE COMPONENT
BOTTOM COMPONENT
COMP (1:6)
V
DD33
EXT INT
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
