ISL78610 Datasheet, PDF (26/98 Pages) Intersil Corporation – Multi-Cell Li-Ion Battery Manager

ISL78610
PACK
VOLTAGE
R3
C7
VBAT
D1
VSS
R1
ISL78610
BASE
Q1
C1
V3P3
V2P5
R2
C3
C5
VCC
C2
VREF
C6
VDDEXT
TO EXTERNAL CIRCUITS
C4
COMPONENT
R₁
R₂
R₃
C₁
C₂, C₃, C₄, C₅
C₆
C₇
D₁
Q₁
VALUE
Note 12
33Ω
27Ω
Note 13
1μF
2.2μF
220nF/100V
PTVS54VS1UTR
Note 14
NOTES:
12. R₁ should be sized to pass the maximum supply current at the minimum specified battery pack voltage.
13. C₁ should be selected to produce a time constant with R₁ of a few milliseconds. C₁ and R₁ provide transient protection for the collector of Q₁.
Component values and voltage ratings should be obtained through simulation of measurement of the worst case transient expected on V_BAT.
14. Q₁ should be selected for power dissipation at the maximum specified battery voltage and load current. The load current includes the V3P3 and VCC
currents for the ISL78610 and the maximum current drawn by external circuits supplied via VDDEXT. The voltage rating should be determined as
described in Note 13.
FIGURE 45. ISL78610 REGULATOR AND EXTERNAL CIRCUIT SUPPLY ARRANGEMENT
Communications Circuits
The ISL78610 operates as a stand-alone monitor for up to 12
series connected cells or in a daisy chain configuration for
multiple series connected ISL78610 monitoring devices. For
stand-alone (non-daisy chain) systems, only a synchronous SPI is
needed for communications between a host microcontroller and
the ISL78610.
In systems where there is more than one ISL78610, both the SPI
port and daisy chain ports are needed for communication.
A daisy chain consists of a bottom device, a top device and up to
12 middle devices. The ISL78610 device located at the bottom of
the stack is called the master and communicates to the host
microcontroller using SPI communications and to other
ISL78610 devices using the daisy chain port. Each middle device
provides two daisy chain ports: one is connected to the ISL78610
above in the stack and the other to the ISL78610 below.
Communications between the SPI and daisy chain interfaces are
buffered by the master device to accommodate timing
differences between the two systems.
The communications setup is controlled by the COMMS SELECT 1
and COMMS SELECT 2 pins on each device. These pins specify
whether the ISL78610 is a stand-alone device, the daisy chain
master, the daisy chain top, or a middle position in the daisy
chain. See Figures 46 and 47 and Table 3. This configuration also
specifies the use of SPI or daisy chain on the communication
ports.
TABLE 3. COMMUNICATIONS MODE CONTROL
COMMS COMMS PORT 1
SELECT 1 SELECT 2 COMM
PORT 2
COMM
COMMUNICATIONS
CONFIGURATION
0
0 SPI
Disabled Stand-alone
(Full Duplex)
0
1 SPI
Enabled Daisy chain,
(Half Duplex)
master device setting
1
0 Daisy Chain Disabled Daisy chain,
top device setting
1
1 Daisy Chain Enabled Daisy chain
middle device setting
The daisy chain ports are fully differential, DC balanced,
bidirectional and AC coupled to provide maximum immunity to
EMI and other system transients while requiring only two wires
for each port.
The addressed device, the top device and the bottom device act
as master devices for controlling command and response
communications. All other devices are repeaters, passing data
up or down the chain.
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FN8830.1
June 16, 2016