MAX17823B datasheet(37/121 Pages) MAXIM

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MAX17823B

12-Channel High-Voltage Data Acquisition System

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Maxim Integrated | 37

Figure 18. HV Charge Pump

Oscillators

Two factory- trimmed oscillators provide all timing requirements: a 16MHz oscillator for the UART and control logic

and a 32.768kHz oscillator for HV charge pump and timers. A special diagnostic counter clocked by the 16MHz

signal is employed to check the 32kHz oscillator. Every two periods of the 32kHz clock, the counter is sampled. If

the count varies more than 5% from the expected value the ALRTOSC1 bit is set as shown in Table 17. A redundant

alert bit, ALRTOSC2, increases the integrity level. If the 16MHz oscillator varies by more than 5%, communication

errors will be indicated

Table 17. Oscillator Diagnostics

Fault

Condition

Alert Bit

Location

32.768kHz oscillator

31.129kHz > fosc_32k > 34.406kHz

ALRTOSC1

FMEA1[15]

32.768kHz oscillator

31.129kHz > fosc_32k > 34.406kHz

ALRTOSC2

FMEA1[14]

16MHz oscillator

15MHz > fosc_32k > 17MHz

ALRTMAN or ALRTPAR

STATUS[4], or STATUS[2]

Device ID Number

The ID1[15:0] register together with ID2[7:0] contain a 24-bit manufacturing identification number, DEVID[23:0]. The

ID combined with the manufacturing date provides a means of uniquely identifying each device. A device ID of zero

is invalid.

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