Datasheet

© 2005-2012 Microchip Technology Inc. DS22018F-page 23
MCP2021/2/1P/2P
Bus Interface
High Level Input Voltage VIH(LBUS)0.6 VBB
—
18 V Recessive state
Low Level Input Voltage VIL(LBUS)-8
—
0.4 VBB V Dominant state
Input Hysteresis V
HYS
——
0.175 VBB VVIH(LBUS) - VIL(LBUS)
Low Level Output Current IOL(LBUS)40
—
200 mA Output voltage = 0.1 VBB,
V
BB = 12V
Pull-up Current on Input I
PU(LBUS)5
—
180 µA ~30 kΩ internal pull-up
@ V
IH (LBUS) = 0.7 VBB
Short Circuit Current
Limit
ISC 50
—
200 mA (Note 1)
High Level Output
Voltage
V
OH(LBUS)0.8 VBB
—
VBB VVOH(LBUS) must be at least
0.8 V
BB
Low Level Output Voltage VOLLO
(LBUS)
—
—
0.2 VBB V
Input Leakage Current (at
the receiver during
dominant bus level)
I
BUS_PAS_DOM -1
—
— mA Driver off,
V
BUS = 0V,
V
BAT = 12V
Leakage Current
(disconnected from
ground)
IBUS_NO_GND -1
—
+1 mA GNDDEVICE = VBAT,
0V < V
BUS < 18V,
V
BAT = 12V
Leakage Current
(disconnected from V
BAT)
I
BUS —
—
10 µA VBAT = GND,
0 < V
BUS < 18V,
T
A = -40°C to +85°C
(Note 3)
50 µA T
A = +85°C to +125°C
Receiver Center Voltage VBUS_CNT 0.475 VBB 0.5
V
BB
0.525 VBB VVBUS_CNT = (VIL (LBUS) +
V
IH (LBUS))/2
Slave Termination Rslave 20
30
47 kΩ
2.2 DC Specifications (Continued)
DC Specifications
Electrical Characteristics:
Unless otherwise indicated, all limits are specified for:
VBB = 6.0V to 18.0V
T
A = -40°C to +125°C
C
LOADREG = 10 µF
Parameter Sym Min. Typ. Max. Units Conditions
Note 1: Internal current limited. 2.0 ms maximum recovery time (R
LBUS = 0Ω, TX = 0.4 VREG, VLBUS = VBB).
2: For design guidance only, not tested.
3: Node has to sustain the current that can flow under this condition; bus must be operational under this
condition.