ZAMC4100 datasheet(92/156 Pages) RENESAS

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ZAMC4100 Datasheet

January 26, 2016

This register contains the number of the consecutive comparator matches before interrupt ADCCMPIF is

generated. If the value of RCMPCNT (Table 3.50) is 00HEX (default value), the counter is bypassed and the

interrupt flag ADCCMPIF (Table 3.39) is set on the first match. When the conversion is running, this register is

accessed as read-only.

3.12.10. External ADC Analog Inputs Open/Short Diagnostics and Protection

ZAMC4100 provides open/short diagnostics for the analog input pins (AINx) and the sensor supply pin S_P as

well. Pins S_P and AIN1,2 also have short-to-battery protection. The internal protection and diagnostic structure

of the S_P and AINx pins is shown in Figure 3.25.

The diagnostic functionality for all pins (S_P, AINx) is controlled by register AINDIAG described in Table 3.43 and

Table 3.44. Table 3.45 gives the meaning of the corresponding open/short flag from the AINDIAG register with

respect to the combination of AINCSHEN and AINCSLEN bits that enable the diagnostic current sinks/sources

connected to the analog input pins.

The protection against a short to Vbat on the S_P and AIN1,2 pins relies on Zener-like structure inside the

ZAMC4100 that limits the voltage propagated to the internal circuitries to a safe level. The limitation of the current

through the S_P pin in the event of such a failure is achieved with an internal resistor connected in series (see

Figure 3.25-A. For the AIN1,2 pins this resistor is external (R2 and R3 on the application diagram as shown in

Figure 6.1).

The protection against a short to GND on the S_P pin is achieved by limitation of the load current. Its value is

specified in Table 1.4 as parameter ISP_OC.

Note: Enabled diagnostic current sources during ADC conversion might result in inaccurate results. Disable all

AINx and S_P pin diagnostics before starting an ADC conversion.

Figure 3.25 ADC Analog Inputs Protection and Open/Short Detection Circuitry

S_P

SPSWEN

VDD5V0

ZAMC4100

A) S_P pin protection and diagnostic

VDD5V0

AINCSHEN

AINCSLEN

Open/Short

Detect

SPOSF

AINx

ZAMC4100

B) AINx pin diagnostic

VDD5V0

AINCSHEN

AINCSLEN

AINxOSF

Open/Short

Detect

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