MAX14920 Datasheet, PDF (18/29 Pages) Maxim Integrated Products – High-Accuracy 12-/16-Cell Measurement AFEs

MAX14920 / MAX14921
High-Accuracy 12-/16-Cell Measurement AFEs
read out the total cell stack voltage, set the [ECS, SC0,
SC1, SC2, SC3] bits to [0, 0, 0, 1, 1]. The total cell stack
voltage can be read during the sample or hold phase.
SPI Serial Interface
Control of the devices is done through a 24-bit SPI inter-
face. The controller sends the serial data to the devices
through the SDI input. The devices simultaneously send
out monitoring data at the SDO output. This scheme
allows daisy-chained operation with other daisy-chain-
able devices, such as ADC converters. Figure 7 shows
the serial bit sequence.
CB1 is the first bit expected from the controller and C1 is
the first bit that the devices sent to the controller. The SDO
data changes on the falling edge of the SCLK signals. The
devices sample the SDI data on the rising edge of SCLK.
SPI Configuration/Control Bits
The configuration/control bits allow enabling of the
charge-balance switches, sampling and holding of all
the cell voltages, selecting the cell for voltage output,
selecting the T_ input channels, and enabling diagnos-
tics mode. Table 1 describes the bits that the devices
receive from the host controller for configuration and
control through SDI.
CS
SCLK
SDI X CB1
CB 2
CB 3
CB 4
CB 5
CB 6
CB 7
CB 8
CB 9
CB10 CB11 CB12 CB13 CB14 CB15 CB16
ECS
SC 0
SC 1
SC 2
SC3 SMPLB DIAG LOPW
X
SDO
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
C13
C14
C15
C16
OP 0
OP 1
REV 0 REV 1 UV_VA UV_VP RDY
OT
X
Figure 7. SPI Serial Interface Bits
Table 1. SPI Configuration/Control Bits
NAME
CB1
CB2
CB3
CB4
CB5
CB6
CB7
CB8
BITS
0
1
2
3
4
5
6
7
ACCESS
W
W
W
W
W
W
W
W
RESET
0
0
0
0
0
0
0
0
0: Set BA1 output low
1: Set BA1 output high
0: Set BA2 output low
1: Set BA2 output high
0: Set BA3 output low
1: Set BA3 output high
0: Set BA4 output low
1: Set BA4 output high
0: Set BA5 output low
1: Set BA5 output high
0: Set BA6 output low
1: Set BA6 output high
0: Set BA7 output low
1: Set BA7 output high
0: Set BA8 output low
1: Set BA8 output high
Maxim Integrated
DESCRIPTION
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