BL15721A Datasheet, PDF (6/11 Pages) SHANGHAI BELLING CO., LTD. – Meter-Bus Transceiver

BL15721A
Power Fail Function
Because of the rectifier bridge BR at the input, BUSL1, and BUSL2, the BL15721A is
polarity independent. The pin VB to ground (GND) delivers the bus voltage V_VB less the
voltage drop over the rectifier BR. The voltage comparator TC2 monitors the bus voltage.
If the voltage V_VB > V_STC + 0.8 V, then the output PF = 1. The output level PF = 0 (power
fail) provides a warning of a critical voltage drop to the microcontroller to save the data
immediately.
Absolute Maximum Ratings
Over operating free-air temperature range(unless otherwise noted)
V_MB
Voltage, BUSL1 to BUSL2
V_I
Input voltage range
RX and RXI
BAT
T_A
Operating free-air temperature range
T_STG
Storage temperature range
±50V
–0.3 V to 5.5 V
–0.3 V to 5.5 V
–25°C to 85°C
–65°C to 150°C
Recommended Operating Conditions (note1)
Min
Max Unit
Receiver
10.8
42
V_MB Bus voltage, |BUSL2-BUSL1|
Transmitter
12
V
42
V_I
Input voltage
VB(receive
9.3
mode)
V
BAT(note2)
2.5
3.8
R_RIDD
R_RIS
T_A
RIDD resistor
RIS resistor
Operating free-air temperature
13
80
KΩ
100
Ω
-25
85
℃
Note1: All voltage values are measured with respect to the GND terminal unless otherwise
noted.
Note2: V_BAT(max) ≤ V_STC – 1 V
Electrical Characteristics(note1)
over operating free-air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Spec
Min. Typ.
∆VBR Voltage drop at rectifier BR IBUS = 3 mA
1.03
Voltage drop at current
∆VCS1
RRIDD = 13 kΩ
source CS1
0.95
IBUS BUS current
VSTC=6.5V,
IMC=0mA
RRIDD = 13 kΩ
RRIDD = 30 kΩ
2.84
1.34
∆IBUS BUS current accuracy
∆VBUS = 10V, IMC = 0 mA, RRIDD =
13 kΩ to 30 kΩ
VSTC = 6.5 V, IMC = 0 mA, VBAT =
ICC Supply current
480
3.8 V, RRIDD = 13 kΩ(note2)
Max.
1.5
1.8
3.3
1.8
2
650
Unit
V
V
mA
%
µA
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Ver1.0