PS810 datasheet(5/46 Pages) MICROCHIP

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DS21904C-page 5

PS810

2.0

ARCHITECTURAL OVERVIEW

The PS810 contains a complete analog “front-end” for

battery monitoring as well as an embedded micro-

controller,

with

supporting

memory,

for

control,

measurement

accumulation,

calculation

and

communications. Major functions within the PS810

include:

• Voltage Regulator

• Precision Time Base

• Temperature Sensor

• 4K x 16 Flash Memory

• 512-byte RAM Memory

• 15-bit plus sign Analog-to-Digital (A/D) Converter

•SMBus/I2C™ or Single Pin Serial

Communications Interface

• PIC18 Microcontroller

Figure 1-1 is a block diagram of the internal circuitry of

the PS810. Figure 1-2 is a schematic diagram that

depicts the PS810 in a typical single cell lithium ion

application. The function of each of the blocks listed

above is summarized in the following sections.

2.1

Internal Voltage Regulator

The PS810 incorporates an internal voltage regulator

that supports 1-cell lithium pack configurations. The

internal regulator draws power directly from the VC1

input. No other external components are required to

regulate circuit voltage.

2.2

Precision Time Base

The integrated precision time base is a highly accurate

RC oscillator that provides precise timing for the sigma-

delta A/D and for the on-chip elapsed time counters

without the need for an external crystal. This time base

trimmed

during

manufacturing

nominal

frequency of 512 kHz.

2.3

Temperature Sensor

An integrated temperature sensor is provided that can

eliminate the need for an external thermistor. As an

option, a connection is provided for an external

thermistor for applications where the battery cell is

physically separated from the PS810.

2.4

Flash Memory

4K x 16 of Flash memory is incorporated for storage of

nonvolatile parameters, such as PowerSmart® 3D cell

models, fuel gauge algorithms and application specific

data.

2.5

RAM Memory

512 bytes of general purpose RAM memory is provided

for storage of temporary parameters.

2.6

A/D Converter

The PS810 incorporates an integrating sigma-delta

A/D converter together with an analog that has inputs

for charge and discharge current, cell voltage, coin cell

voltage, the on-chip temperature sensor and an off-chip

thermistor. The converter can be programmed to per-

form a conversion with resolutions of 8 to 15 bits + sign,

while utilizing either a single-ended +300 mV or a

differential ±150 mV reference.

2.7

SMBus/I2C™ or Single Pin Serial

Communications Interface

This communications port for the PS810 is selectable

as a 2-pin industry standard SMBus/I2C or a single pin

interface. All commands, status and data are read or

written from the host system via this interface.

2.7.1

SMBus/I2C

The two pin communication interface uses one clock

pin and one data pin and is compatible with the industry

standard System Management Bus (SMBus) and the

Inter IC Communication Bus (I2C).

2.7.2

SINGLE PIN SERIAL INTERFACE

The Single Pin Serial (SPS) interface consists of one pin

only: the SDA/SPS pin (pin 14). This communication is

an asynchronous return-to-one protocol. The timing of

the driven low pulses defines the communication.

2.8

PIC18 Microcontroller

The PIC18 is a high-performance, CMOS, fully static

8-bit microcontroller. The PIC18 employs an advanced

RISC architecture. This device has enhanced core

features, such as 31 level deep stack and multiple

internal and external interrupt sources. The separate

instruction and data buses of the Harvard architecture

allow a 16-bit wide instruction word with a separate 8-bit

wide data bus. The two-stage instruction pipeline allows

all instructions to execute in a single cycle, except for

program branches, which require two cycles. A total of

75 instructions are available.

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