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| Telecommunications switch with improved redundancy |
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Method for communicating between a microprocessor and an interface circuit
| Details |
Inventors: Stockstad, Troy L.; Bacchi, Matthew F.; Brown, Martin J.;
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Examiner: Harvey; Jack B.
Assistant Examiner: Etienne; Ario
Attorney, Agent or Firm: Zhou; Ziye, Dover; Rennie William
A protocol between a microprocessor (21) and an interface circuit (11). The interface circuit (11) transmits an enable signal (124) to the microprocessor (21). Upon receiving the enable signal (124), the microprocessor (21) transmits a set of pulses of a window signal (125) to the interface circuit (11), which in turn provides the microprocessor (21) with information concerning a circuit element (36) through a data signal (127). The microprocessor (21) initiates a command by transmitting a pulse of a command signal (126) to the interface circuit (11). The interface circuit (11) accepts and executes the command only if a predetermined chronological condition between the pulse of the command signal (126) and a corresponding pulse of the window signal (125) is satisfied. The microprocessor (21) identifies a malfunctioning interface circuit (11) by timing the enable signal (124) received from the interface circuit (11). |
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DETAILED DESCRIPTION OF THE DRAWINGS FIG.
1 is a block diagram of a battery maintenance system 10 which uses a protocol between a microprocessor and an interface circuit in accordance with an embodiment of the present invention.
Battery maintenance system 10 is adapted to protect a battery pack 36.
Battery maintenance system 10 includes a battery control unit 11, which serves as the interface circuit coupled to a microprocessor such as a microcontroller 21.
Microcontroller 21 receives status information about battery pack 36 from battery control unit 11 and initiates commands to battery control unit 11 via an enable signal line 24, a window signal line 25, a command signal line 26, and a data signal line 27.
In addition, microcontroller 21 communicates with a host (not shown in FIG.
1) such as a portable computer, a cellular phone, or other electronic equipment through a host interface 22 and a serial port 28.
Battery control unit 11 keeps battery pack 36 operating in a safe operating area, sends status information about battery pack 36 to microcontroller 21, and executes the commands initiated by microcontroller 21.
Battery control unit 11 includes a monitor 12, a timer 14, an analog to digital (A/D) converter 16, and an interface 18.
A state counter 15 in timer 14 periodically places monitor 12 under the control of microcontroller 21 as will be discussed with reference to FIG.
2.
Monitor 12 measures the parameters which are relevant to the operating conditions of battery pack 36 and keeps battery pack 36 operating within a safe operating area.
As discussed supra, the relevant parameters include a current flowing through battery pack 36, a voltage across each battery cell in battery pack 36, an ambient temperature of battery pack 36, etc.
By way of example, the current flowing through battery pack 36 is measured by sensing a voltage across a resistor 37, and the ambient temperature of battery pack 36 is measured by using a temperature sensor 38.
A/D converter 16 converts the measured parameters into data signal pulses such as, for example, pulses whose widths are modulated
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