MCZ33990EF Freescale Semiconductor, MCZ33990EF Datasheet - Page 10

• Manufacturer Part Number: MCZ33990EF
• Description: IC TRANSCEIVER J-1850 BUS 8-SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MCZ33990EF

• Applications: *
• Interface: *
• Voltage - Supply: *
• Package / Case: 8-SOIC (3.9mm Width)
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

the SAE Standard J-1850 Class B performance for bi-
directional half-duplex communication. The device is
packaged in an economical surface-mount SOIC plastic
package. An internal block diagram of the device is shown in
Figure
voltage extremes from being built on a SMARTMOS process,
Input Power (VBAT Pin)
operate the 33990. The internal voltage reference of the
33990 will remain fully operational with a minimum of 9.0 V
on this pin. Bus transmissions can continue with battery
voltages down to 5.0 V. The bus output voltage will follow the
battery voltage down and, in doing so, track approximately
1.6 V below the battery voltage. The device will continue to
receive and transmit bus data to the microcontroller with
battery voltages as low as 4.25 V. The pin can withstand
voltages from -16 V to 40 V.
Sleep Input (
transmitter. The Class B receiver is always enabled so long
as adequate V
voltage is 5.0 V, the Class B transmitter is enabled. If this
input is logic low, the Class B transmitter will be disabled and
less than 65 µA of current will be drawn by the V
pin also provides a 5.0 V reference, internal to the device,
used to establish the Rx output level and slew rate times.
Class B Functional Description
7.0 V waveform on the BUS output. It also receives
waveforms and transmits a digital level signal back to a logic
IC. The transmitter can drive up to 32 secondary Class B
transceivers (see
nodes may be at ground potentials that are ± 2.0 V relative to
the control assembly. Waveshaping will only be maintained
during 2 of the 4 corners when the 0 to ± 2.0 V ground
potential difference condition exists. The 33990 is a
secondary node on the Class B bus. Each secondary
transceiver has a 470 ± 10% pF capacitor on its output for
EMI suppression purposes, as well as a 10.6 kΩ ± 5% pull-
down resistor to ground. The primary node has a 3300 ± 10%
pF capacitor on its output for EMI suppression, as well as a
10
33990
FUNCTIONAL DESCRIPTION
INTRODUCTION
The 33990 is a serial transceiver device designed to meet
The 33990 derives its robustness to temperature and
This is the only required input power source necessary to
This input is used to enable and disable the Class B
The transmitter provides an analog waveshaped 0 V to
2.
BAT
SLEEP
Figures 11
pin voltage is applied. When the
Pin)
and 12). These secondary
FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
BAT
SLEEP
pin. The
INTRODUCTION
pin
incorporating CMOS logic, bipolar/MOS analog circuitry, and
DMOS power FETs. Though the 33990 was principally
designed for automotive applications requiring SAE J-1850
Class B standards, it is suited for other serial communication
applications. It is parametrically specified over an ambient
temperature range of -40°C ≤ T
16 V supply. The economical 8-pin SOICN surface mount
plastic package makes the device a cost-effective solution.
1.5 kΩ ± 5% pull-down resistor to ground. With more than 26
nodes, there is no primary node (see
will have a 470 ± 10% pF capacitor and a 10.6 kΩ ± 5% pull-
down resistor. No matter how many secondary nodes are on
the Class B bus, the RC time constant of the Class B bus is
maintained at approximately 5.0 μs. The minimum and
maximum capacitance and resistance on the Class B bus is
given by the expressions shown in
10.6 kΩ
Figure 12. Maximum Number of Nodes
10.6 kΩ
Figure 11. Minimum Bus Load
470 pF
470 pF
Analog Integrated Circuit Device Data
24 Secondary Nodes
A
Primary Node
≤ 125°C and 7.0 V ≤ V
1.5 kΩ
442 Ω
One Primary Node
Freescale Semiconductor
Table
1.5 kΩ
Figure
6.
11280 pF
3300 pF
13). All nodes
3300 pF
BAT
≤