LTC6802IG-1#PBF Linear Technology, LTC6802IG-1#PBF Datasheet - Page 21

• Manufacturer Part Number: LTC6802IG-1#PBF
• Description: IC MONITOR BATT STACK MC 44-SSOP
• Manufacturer: Linear Technology

Specifications of LTC6802IG-1#PBF

• Function: Battery Monitor
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 4 V ~ 50 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 44-SOP (0.200", 5.30mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIONS INFORMATION
Network Layer
Broadcast Commands: A broadcast command is one to
which all devices on the bus will respond. See the Bus
Protocols and Commands sections.
In daisy chained configurations, all devices in the chain
receive the command bytes simultaneously. For example,
to initiate A/D conversions in a stack of devices, a single
STCVAD command byte is sent, and all devices will start
conversions at the same time. For read and write com-
mands, a single command byte is sent, and then the stacked
devices effectively turn into a cascaded shift register, in
which data is shifted through each device to the next higher
(on a write) or the next lower (on a read) device in the
stack. See the Serial Command Examples section.
PEC Byte: The Packet Error Code (PEC) byte is a CRC
value calculated for all of the bits in a register group in
the order they are read, using the following characteristic
polynomial:
On a read command, after sending the last byte of a register
group, the device will shift out the calculated PEC, MSB
first. For daisy-chained devices, after the PEC is read from
the first device, the data from any daisy-chained devices
will follow in the same order. For example, when read-
ing the flag registers from two stacked devices (bottom
x
8
+ x
CSBI
SCKI
SDO
SDI
2
+ x + 1
MSB (CMD)
BIT6 (CMD)
Figure 10. Transmission Format (Poll)
LSB (CMD)
device A and top device B), the data will be output in the
following order:
Toggle Polling: Toggle polling allows a robust determina-
tion both of device states and of the integrity of the con-
nections between the devices in a stack. Toggle polling
is enabled when the LVLPL bit is low. After entering a
polling command, the data out line will be driven by the
slave devices based on their status. When polling for the
A/D converter status, data out will be low when any device
is busy performing an A/D conversion and will toggle at
1kHz when no device is busy. Similarly, when polling for
interrupt status, the output will be low when any device
has an interrupt condition and will toggle at 1kHz when
none has an interrupt condition.
Toggle Polling—Daisy-Chained Broadcast Polling: The
SDO pin (bottom device) or SDI pin (stacked devices) will
be low if a device is busy/in interrupt. If it is not busy/not
in interrupt, the device will pass the signal from the SDOI
input to data out (if not the top-of-stack device) or toggle
the data out line at 1kHz (if the top-of-stack device).
The master pulls CSBI high to exit polling.
Level polling: Level polling is enabled when the LVLPL
bit is high. After entering a polling command, the data
out line will be driven by the slave devices based on their
status. When polling for the A/D converter status, data
FLGR0(A), FLGR1(A), FLGR2(A), PEC(A), FLGR0(B),
FLGR1(B), FLGR2(B), PEC(B)
POLL STATE
LTC6802-1
68021 F10
21
68021fa