I+ME ACTIA BMS Master 4, Hardware Manual, Page: 38 / 76

Hardware Manual
BMS Master 4 / 4.5
Ref.: IR14417 A 15.01.2018 Page 38/76
Pin numbers counting from left to right with the PCB battery interface on top.
See chapter 3.4.3 page 34
Due to double pin assignment every signal may be connected twice to achieve proper
connections with one wire per cage only. Wire gauge must not exceed 0.5 mm². The
use of shielded twisted pair cable for the serial connection is strongly recommended
when the cabling distances are longer than a few centimeters.
Example connecting several slaves to one master see 2.3 Schema “Slaves”.
3.4.4.6 C
ONFIGURATION
I
NTERFACE
Each SLAVE_C has to have its own slave address number to be identified by the MASTER.
The SLAVE_C may be configured via this port without being connected to any other power
supply. The configuration data will be stored in the serial E²ROM.
Connector assignment:
- Pin 1: 5V
- Pin 2: Datachannel (RX/TX)
- Pin 3: GND
See chapter 3.4.3 page 34
3.4.4.7 S
ENSOR
-
AND
PTC-I
NTERFACE
An external 12-bit ADC measures the temperature of the connected NTC which has to be
according to the software an EPCOS B57703M0303G040 with a cold resistance of 30 k
 at
25°.
The voltage of the PTC is measured by the internal 8-bit AD-channel 0. These inputs may be
used to detect over-temperatures in each single cell. For this purpose each cell is supplied
with a PTC connected serially in a chain. The total cold resistance of all PTCs must be less
than 10 k
 . A proper example for a PCB would be EPCOS B59701C0070 in 0805-size to
detect over-temperatures above 70 °C. The total cold resistance of a chain of ten PTCs will
be less than 5 k
 at 25 °C.
If only one single PTC becomes high resistive due to over-temperature in one of the cells
(the total chain resistance must exceed 22 kΩ), the FAILn–output will be activated and the
event is signalled to the MASTER.
The PTC-interface for over-temperature is always active while there is communication traffic
on the RS485 interface and two seconds longer. The active state of the PTC-interface cannot
be changed by parameterizing. To disable the temperature control a resistor of 100 to 1000
 has to be connected to the PTC port.
The interface for temperature measuring and over-temperature control is realized as 6 cage
clamps (PHOENIX PTSA).