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ZSSC1750 / ZSSC1751 Datasheet

April 20, 2016

Circuit Description

2.1

Overview

The ZSSC1750/51 is a data acquisition System Basis Chip (SBC) assembled in a PQFN36 6x6mm package. It

contains a high voltage circuit, analog input stage including peripheral blocks, sigma-delta (

ΣΔ) ADCs

(SD_ADC), digital filtering, and a LIN transceiver (for ZSSC1750 only). Communication between an external

microcontroller and the SBC is handled by a Serial Peripheral Interface (SPI). The functions of the ZSSC1750/51

are controlled by register settings. The circuit starts after power-on with default register and calibration settings

that can be overwritten by the user’s software.

One input channel measures IBAT via the voltage drop at the external shunt resistor. The second channel

measures VBAT and the temperature. By simultaneously measuring VBAT and IBAT, it is possible to dynamically

determine Rdi, which is correlated with the state of health (SOH) of the battery. By integrating IBAT, it is possible

to determine the state of charge (SOC) of the battery. These are the fundamental parameters for an intelligent

battery sensor. The necessary microcontroller and the software for determining these parameters is not part of

the ZSSC1750/51.

Figure 2.1

Functional Block Diagram

MCU_CLK

IRQN

VDDP

VDDC

ZSSC1750/51 Analog Front End SBC

Common

Ground

PGA

MUX

VBAT

LIN

VDDP_REG

BG_REF

WD_TIMER

VDDC_REG

OSC

GP_TIMER

LP_REG

VDDA_REG

DIGITAL

FILTER

CONFIG

RESULT

DIGITAL

FILTER

CALIBRATION

DATA PATH

SHUNT

–

BATTERY

SD_ADC

RREF

NTC

LIN_PHYS

(1)

RXD

TXD

CSN

SCLK

MISO

MOSI

VDDE

VDDA

INP

INN

VBAT

NTH

LIN

Analog

Block

Digital

Block

SBC_PMU

MCU_RSTN

SLEEPN

IRQ_CTRL

SPI

WDT_DIS

1) Available in ZSSC1750 only.

NTL

During the Standby Mode and the system’s Sleep Mode (e.g., engine is off), the system periodically measures

the values to monitor the discharge of the battery (see section 3.7 regarding modes). Measurement cycles are

controlled by the user’s software and are dependent on the detected events. The ZSSC1750/51 is designed for

low current consumption during Sleep Mode in the range of less than 60µA.

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