SM-B79
SM-B79 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: A.R - Reviewed by M.B. - Copyright © 2021 SECO S.p.A.
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2.3
Electrical Specifications
SM-B79 board needs to be supplied with a single voltage in the range 9V
DC
.. + 24V
DC
. All the others voltages necessary for the working of the board and of the
connected peripherals are derived from the main V
IN
power rail.
The power connector is type Molex Mini-Fit Jr connector, type MOLEX p/n 39-28-
1043 or equivalent.
The pin-out is indicated in the table here on the left, and the mating connector is
MOLEX p/n 39-01-2040 or equivalent with crimp terminals series 5556/44476.
2.3.1
Smart Battery Connector
It is possible to supply the board also by using external SMART batteries. Input voltage range, in this case, must be in the range 6..17V
DC
.
To do this, a 8-pin male connector is provided, type HR p/n A2001WR-S-08PD01 or equivalent, with
pinout shown in the table on the left.
Mating connector: JST PHR-8 crimp housing with JST SPH-002T-P0.5L crimp terminals.
SMB_CLK_BAT: Smart Battery System Management bus bidirectional clock line, +3.3V_DSW electrical level with
2.
, derived by I2C_PM_CK signal
SMB_DAT_BAT: Smart Battery System Management bus bidirectional data line, +3.3V_DSW electrical level with
pull up resistor, derived by I2C_PM_DAT signal
SAFETY: Smart Battery System Management safety input signal, used to communicate critical errors and/or safety
mechanisms to prevent over-charging, over-discharging, over-temperature and other conditions that are dangerous or
could adversely affect battery longevity. This signal goes directly from the battery to the on-board charger.
Power IN Connector CN3
Pin Signal
Pin Signal
1
GND
2
GND
3
VIN
4
VIN
SMART Battery Connector CN6
Pin Signal
1
VBAT
2
VBAT
3
N.C.
4
SMB_CLK_BAT
5
SMB_DAT_BAT
6
SAFETY
7
GND
8
GND